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.

Surely if you read the article you read the “But You're Still on Facebook and TikTok?” section and don’t need me to explain what it said - but i can summarize:

Twitter is un-aligned with their goals, and has dismal reach. Facebook and instagram are unaligned with their goals and are how they reach a lot of new people.

Not super complicated, tho if i am reading between the lines - calling out the numbers feels like a call to action for other orgs. Suggesting they run their own numbers, and get off twitter.