“Over 60 German-speaking universities and research institutions have decided to take a stand and collectively announce their decision to cease activities in the social network X (formerly Twitter). This withdrawal comes in response to the platform's current direction, which is incompatible with the core values of the participating institutions: openness to the world, scientific integrity, transparency, and democratic discourse.”
This is how you do it.
https://press.uni-mainz.de/universities-and-research-institutions-leave-social-network-x/