The problem for the EFF is that they don't have anywhere else to go with nearly the reach of Twitter. Bluesky has only 15 million monthly active users. They could pin their hopes on Facebook, but it's hard to think of a criticism of Twitter that wouldn't apply to Facebook.
Basically the problem for EFF and a lot of the progressive activist orgs out there is that they want a mass global audience but a platform with progressive activist moderation, and that was possible in the heyday of the Biden Administration, but starting with Musk's purchase of Twitter and firing of much of the progressive activist staff, together with the loss in the Missouri vs Biden consent decree, it's getting harder to find a truly mass audience social media platform that is willing to enforce progressive activist social norms.
As this realization sinks in, we are seeing organization after organization rage quit the mass market platforms and join more niche platforms that is moderated to their niche taste (e.g. mastodon, bluesky, etc), and this is just one example of that. The EFF of old would never have seen this as a problem, but for the present day EFF it's a big problem.
Another option is a medium without engagement at all. You post your stuff and that's it, for example you can quote/amplify but not comment. No zingers, mocking quote tweets, no clapbacks, etc. I think an organization like the EFF could tolerate that, they want a pure write-only medium where you make a PR announcement that gets lot of attention but is not subject to any disparagement.
Big orgs would love a system like that, but I'm not convinced it could draw a lot of eyeballs.