See the link by Innerworld below.

A highlight:

And while the tweet praises Trump’s pick for leading antitrust at the DOJ, it is exceedingly clear that he did not directly endorse Trump himself or Republicans in general.

It felt very much like a witch hunt every time Proton was criticised. Almost like other VPNs wanted to tarnish them. But that would be a conspiracy to think I guess.

Now, I don't know any more, but that one tweet seems to be the only bad thing Proton has done as an organisation, which is a non bad track record IMO.