I'm a former EFF member and donor and have an X account. Their engagement problem isn't with X or X's members. It's with the EFF itself.

A decade ago they lost the plot. They pulled some bullshit and lied to their entire membership in order to boost their cronies/friends at the Library of Congress. They framed efforts to keep the LoC under loose Congressional/Presidential oversight and free to do as they want as some Anti-Trump fight. Requests about why they would do this went completely unanswered to the membership.

The EFF Board serves their own goals and believe themselves unaccountable to their membership, so they no longer get my money and I no longer entertain or signal boost their message.