Yes, EFF is a civil liberties group and always has been, which makes it a purely ideological movement.
Let's be honest and look at the engagement numbers of the post announcing this:
X post: 124 comments, 79 reblogs, and 337 likes
BlueSky post: 245 comments, 1400 reblogs, and 6.2K likes
Mastodon post: 403 reposts, 458 likes
These numbers, combined with the facts that Mastodon and BlueSky are aligned with internet freedoms while X is strongly aligned against internet freedoms, make for a clear-and-cut case that it's past time to leave the platform.
Which internet freedoms is X strongly aligned against?
Just one example, but having to be logged in to view most content on there was a recent change that made it pretty hostile to the openness of the web platform.
You can find links to other criticisms of twitter in TFA:
Interop: https://www.eff.org/deeplinks/2021/01/twitter-and-interopera...
Privacy: https://www.eff.org/deeplinks/2020/04/twitter-removes-privac...
https://www.eff.org/deeplinks/2017/08/twitter-and-others-dou...
https://www.eff.org/deeplinks/2019/10/twitter-uninentionally...
Accountability: https://www.eff.org/deeplinks/2015/08/twitter-axes-accountab...
DM encryption: https://www.eff.org/deeplinks/2020/07/after-weeks-hack-it-pa...
All of them, I think?
https://en.wikipedia.org/wiki/Internet_freedom
Banned third party clients and interoperability. Use their software to access your data on their servers, on their terms, or get shut down. Hard to think of anything more anti-internet freedom. I left when they did that, years ago.
They would not be able to enforce it on desktop computers, short of banning every user one-at-a-time, but they can easily blanket-ban it on mobile phones by requesting Apple and Google remove unauthorized third-party clients from their app stores. (Which they will do. Apple even lists unauthorized clients for services controlled by other parties as against the rules. Whatever that means.)