EDRi. https://edri.org/about-us/victories/

Kind of answering my own question, but in Germany there seem to be:

https://freiheitsrechte.org/

https://chat-kontrolle.eu/

Can anyone comment on the reputability of these initiatives?

You cannot fight this with technology. What will you do when they make connecting to instant messager servers without scanning illegal? VPN? They are already going after VPNs.

"VPN services may soon become a new target of EU lawmakers after being deemed a "key challenge""

https://www.techradar.com/vpn/vpn-privacy-security/vpn-servi...

You don't need to ask anyone to connect to a decentralized IM. This all the way till encryption is banned for personal use.