I stopped buying computer magazines a long while ago.
For a time, my brother and I had a dedicated bookshelf to our PC Pro's, PC Magazines and others. I still have entire runs of ZX Spectrum magazines and the like.
But they changed. First, they started getting thicker and thicker with mail order ads. It didn't matter, because the content was much the same as ever. The coverdiscs were invaluable. The reviews were in-depth. The technical articles did not shy from complex topics. There was all kinds of editorial in that about the direction of the industry and new and old technology and it wasn't just a industry journal, it was a tutorial, a textbook, etc. too.
Then they started getting thinner and thinner and more and more expensive. The ads took over. The content was rehash after rehash. They lost most of their big-name columnists and I didn't know who anyone was any more or if I could trust what I was reading when they told me about the "next big thing".
The reviews became shallow and worthless. 20 years later they were still "comparing the best inkjets" almost every issue. The content got dumbed down and what used to be 5-10 pages of in-depth Perl coding was a couple of short lines of PHP spread across one page and the rest wasn't even on the coverdisk any more (what are those?!) but someone on the Internet that disappeared a year later.
Nothing in there was ever referred back to again. I now read an article, move on. There was nothing there to keep, even for posteriety (Am I going to type in a ZX Spectrum BASIC listing ever again? No. But I kept them all because I loved how the article was written and it taught me something every time). Our old PC Pros were always referred back to as a reference for years and year after they were written.
Then they started getting silly - the prices skyrocketed, the magazines became more like a flyer, the useful content dropped to zero, and everything inside was a rehash of earlier stuff. Even the reviews had dropped from, say, 20 pages of the same types of products facing-off with one page dedicated to each product in depth, to 1 page with sometimes individual products getting maybe a paragraph or so. I'm hoping you'll review the product in-depth and save me some money by highlighting the flaws etc. or where I could buy better... now I might as well read an Amazon review because it's more in-depth.
They used to have Q&A sections which are actually really interesting, and now every question is trivial and every answer is pathetic and without explanations. They used to have letters pages where you could see a long-running discussion brought out and summarised.
I'm not paying GBP7.99 for about 30 pages, many with adverts, of bare content, no disc, no exclusive online content/software (that's how they weaned us off discs, but they don't even do that any more) and no reason to keep an issue once you've read it.
I stopped buying a long time ago and moved onto Readly free trials and the like to occasionally check into them for recent years (because they've all moved to that kind of distribution). They've got worse, if anything. Often their online content is just a scanned PDF, not even searchable (presumably for fear someone will index it? I don't know), in horrible interfaces that make reading difficult, and the price has gone up even more. I can skim an entire issue in about a minute or two and the last dozen or so times I've done so... there's been nothing of interest in there, nothing I even click and think "Oh, that looks interesting, I'll read up on that online".
Linux Format isn't alone. Most of those magazines are made by the same few publishers and they've all been dying off for decades now. Even when I'm in an airport lounge and there's something there I would spend stupid money on for me to read on the plane... I don't any more. For a few years, that was the only reason I bought computer magazines. I've even stopped doing that. There's just not enough in them to justify it.
I'd honestly rather pick up a PC Pro from the 1990's and know that it'd take me a good couple of hours to get through just the bits I find interesting in it.
Computer magazines killed themselves, as far as I'm concerned. The dearth and shallowness of content, the pricing, etc. It's not even like there's not a raft of OTHER content out there they could be pointing you at. If I found someone like me and went through their bookmarks, I'd find DOZENS of things I consider extremely interesting and had never seen online before, guaranteed. But they don't even function in that way.
And, honestly, there is no replacement (thus no competition as such). It's not that I've "gone online" and found everything I was looking for in that regard. There's still a massive piece missing of good editorial content wrapping up complex issues, projects, etc. that isn't filled by any one place, or even a combination of places, and the legwork I have to do myself nowadays to collate together reading material for any topic of interest is enormous and wasteful and woefully incomplete. Even tutorials on new tech, people have totally lost the art of being able to write something engaging now, even the same companies that MADE that tech and are trying to sell it to us, and - no - a YouTube video is no substitute at all.
We've lost something there. A few months back my brother finally scrapped the last of his 90/00's PC Pro's, which were still taking up enormous shelf space and causing our bookshelves to bow under the weight. We haven't replaced them with anything at all.