Well, the latest development I've seen is they're deleting (censoring) comments calling out the political bias of their CEO on their post about how they're fighting against censorship:

https://www.reddit.com/r/ProtonVPN/comments/1ij4qn9/behind_the_scenes_of_proton_vpns_fight_against/

Here's an evidenced account of part of what their CEO asserted:

This is what the CEO posting as u/Proton_Team stated in a response on r/ProtonMail:

Here is our official response, also available on the Mastodon post in the screenshot:

Corporate capture of Dems is real. In 2022, we campaigned extensively in the US for anti-trust legislation.

Two bills were ready, with bipartisan support. Chuck Schumer (who coincidently has two daughters working as big tech lobbyists) refused to bring the bills for a vote.

At a 2024 event covering antitrust remedies, out of all the invited senators, just a single one showed up - JD Vance.

By working on the front lines of many policy issues, we have seen the shift between Dems and Republicans over the past decade first hand.

Dems had a choice between the progressive wing (Bernie Sanders, etc), versus corporate Dems, but in the end money won and constituents lost.

Until corporate Dems are thrown out, the reality is that Republicans remain more likely to tackle Big Tech abuses.

Source: https://archive.ph/quYyb

To call out the important bits:

1. He refers to it as the "official response"
2. Indicates that JD Vance is on their side just because he attended an event that other invited senators didn't
3. Rattles on about "corporate Dems" with incredible bias
4. States "Republicans remain more likely to tackle Big Tech abuses" which is immediately refuted by every response

That was posted in ther/ProtonMail sub where the majority of the event took place: https://old.reddit.com/r/ProtonMail/comments/1i1zjgn/so_that_happened/m7ahrlm/

However be aware that the CEO posting as u/Proton_Team kept editing his comments so I wouldn't trust the current state of it. Plus the proton team/subreddit mods deleted a ton of discussion they didn't like. Therefore this archive link captured the day after might show more but not all: https://web.archive.org/web/20250116060727/https://old.reddit.com/r/ProtonMail/comments/1i1zjgn/so_that_happened/m7ahrlm/

Some statements were made on Mastodon but these are subsequently deleted, but they're capture by an archive link: https://web.archive.org/web/20250115165213/https://mastodon.social/@protonprivacy/113833073219145503

I learned about it from an r/privacy thread but true to their reputation the mods there also went on a deletion spree and removed the entire post: https://www.reddit.com/r/privacy/comments/1i210jg/protonmail_supporting_the_party_that_killed/

This archive link might show more but I've not checked: https://web.archive.org/web/20250115193443/https://old.reddit.com/r/privacy/comments/1i210jg/protonmail_supporting_the_party_that_killed/

There's also this lemmy discussion from the day after but by that point the Proton team had fully kicked in their censorship so I don't know how much people were aware of (apologies I don't know how to make a generic lemmy link) https://feddit.uk/post/22741653