It wasn't always like this - the requirement to give your ID to get a SIM card, as you noted, was only introduced in 2017 (though it certainly feels way longer ago for me).

Anyways - why does nobody care?

Simple: most don't feel this being an issue.

Some may even say that they "don't have anything to hide" and there goes the erosion of privacy, bit by bit - by the time someone notices "ok, this may become a problem" - it'll be too late :(