Why should they bother to cater to EU rulings?
(Also, 90% of complying with GDPR is just ethics -- tell if you sell data to third parties, ask consent if you want to do nonessential processing, etc. -- and 10% is adding boilerplate text like reiterating your rights. But that's a bit of a separate discussion, I just feel like most people are not aware of this when starting these discussions and it might be good to know when talking about the topic.)
To be honest I also don't see the point of the EU blocks, as you say. I assumed it was mostly just lazyness and unwillingness to deal with the issue at all.