I had the opposite impression, that this decision was primarily economic in nature. People (or at least the sort of people interested in the EFF) simply aren't on X/Twitter anymore, and so it's not worth posting there.
What is the cost of posting to X in addition to Tiktok, Bluesky, and Facebook? If it's not effectively $0, it should be.
This is completely performative, and I personally don't think it's the best move.
But what is the cost of posting on X? Why do they even have a blue tick?