Ok, based off what I read, 1 & 3 are true but they are common business practices used in multiple areas. 2 is completely false but market forces make it look true.
A good example of 1 & 3 is Coke. If you decide to have Coke in your business, Coke will give you things as promotional considerations. Signs with you name on it plus the Coke logo, etc. But to get those you have to not carry Pepsi. That's the crux of 1 & 3. If you want to carry both, then you don't get the goodies that go along with them. You can preload Play with something else, but not Maps, Gmail and the other unless you agree to exclusivity for the preinstalled items. (The Play concession was made a while back to satisfy some anti-trust worries). More manufactures don't do that though because of the incentives plus market forces. People want Google's stuff there and ready. Google isn't holding a gun to people's head saying "Use Gmail or else". There are plenty of option and I use one myself in the form of AquaMail to my non-Gmail e-mail.
As for #2, hello, phones being sold running Cyanogen and others based on AOSP derivatives, but they don't have a big market share yet, or maybe ever. Market forces (people) aren't creating a demand for them. Thus the big guys don't make Cyanogen phones because people won't buy them en mass. And it's not for a lack of trying. Look at Samsung and all the times they've tried to do Tizen as an Android alternative. They never got anywhere. The mass market is happy with what they have. Phone OSs are a two horse race (Android and iOS). You're not going to force the market to accept more if they don't want it, but that's seems to be what the EU is angling for with #2.
This is just how I see it. I'm sure someone is going to come along with some conspiracy and collusion theory as to why I'm wrong, but this is a situation where the simple answer is the answer.