This was the intent of the inquiries.
However, I think the title is a bit misleading. I wouldn't say the research is "buckling". It's definitely been a headache, and sure there are some people who would rather not deal with the ever-increasing death threats, but that applies to many areas of research.
The question is how they're going to try and stop funding research into this. The research around this is especially important from a national security perspective, because it's become easier than ever to slide propaganda into social media and news media. If you've got enough resources, you can likely sway elections even easier than before.
Yes-- same with bluetooth or ordering groceries for delivery and giving your home address. There's always ways to leak data and make it no longer anonymous. However, from my knowledge of how some of these datasets work, they aren't putting in a lot of effort into truly trying to make sure the joins are 100% accurate because it rarely matters. They generally don't give a shit about you as an individual. The most common uses of the data are for advertising and mistargeting doesn't cost enough to justify the time to verify the data.
Paying in cash though can make it anonymous, or by using virtual cards that mask your card id.