This specific comment thread is focused on that because that was the topic started by the choice of words of the first comment.

The conversation would not have continued in that direction if instead of doubling down there simply were an admission that what really was meant to say is not that Proton betrayed some hypothetical anti-Trump principles they had, but that they have proven now being sympathetic towards Trump and this made people feel unsafe (and some branches of the thread implied that conclusion).

What's being argued is that this is not surprising. This is as silly as thinking that Zuckerberg is a betrayer because of the recent changes in moderation policy, as if Facebook was ever on the side of any particular political ideology other than their own interests.

What makes you think tuta is against all and every policy coming from the far-right including the ones that align with their stated goal of digital privacy? If (hypothetically) tuta had some level of relationship with a left-wing party (pick your favorite) and made a post about how they are happy about certain changes that party is pushing that are beneficial to privacy, would that be a betrayal of their own principles? I would say it's not, regardless how many alt-right customers might "feel betrayed" if they had some parasocial alt-right image of tuta.