Using Twitter in 2026 is a political statement. I don't consume it, but using Twitter would be supporting right wing extremism (or whatever you classify Musk as).
And even if that was the reason, that doesn't make sense. They're an activist organisation, their goal is to promote their ideas to people that need to hear them, and twitter users need that more than bluesky users.
Btw. I login to twitter once every few months to share my blog post or report. That's not a political statement.
It is indirectly a political statement to use Twitter. You are supporting Elon Musk who has made himself a central figure in extreme right wing political views.