- He is just a small time streamer, I didn't watch his videos but it looks like typical clickbait content playing on people's paranoia. Why would Palantir care about it?

- I didn't watch the videos in question, but I suppose that he says that Palentir is evil because it is used by police forces to attack poor migrants, that kind of thing. Not only he is saying what everyone is saying, but it may be good advertising for Palantir, as it shows that they are good at their (evil) job.

- Streisand effect, I am sure that even the idiots at Palantir know that it may not be a good idea to give attention to a streamer who annoys them.

- Speaking of attention, it is highly likely that the streamer in question was unbanked for a completely unrelated reason but saw the opportunity to make buzz, and it seems to be working!

- There seem to be no further evidence connecting the two.

The streamer is a self-admitted basket case who does not “believe in coincidences”. As far as weird internet belief systems go, this one seems even a bit weirder than people who refuse to believe in a somewhat spherical earth.

It should be against the law to privately retaliate like this.

Consumer protection laws obviously don't apply to businesses, and banks close business accounts all the time for not following the terms of services. That sounds like a MUCH more probably cause than "I said mean things about Palantir".

https://simple.wikipedia.org/wiki/Post_hoc_fallacy