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...
Have you tried using Facebook, Linked-In, or Instagram while not logged in?
I'm not sure why you're using Zuckerberg's sites as examples of internet freedoms.
TFA mentions that EFF continues to post on Facebook and Instagram.