Comment Re:It’s for spamming (Score 1) 37
Because there are essentially only 2 or 3 SMS gateways, which all have really damn good filtering at scale.
Not talked about much, but the backhaul SMS network (known as "aggregators") is similar to the internet in that there are large backhaul providers and then "last mile" providers (such as cell carriers, or companies like apple / google / twilio) that all run through the same aggregators.
The aggregators are pretty damn good at processing / filtering spam. Also, when you see text messages that say you can respond w/ "STOP", this is handled at the aggregator level, and will block that originator from issuing more messages your cell number.