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Re:Patent Trolls Inbound: Our First Lawsuit by dpifke on Wednesday August 24, 2022 @10:11PM (#32588583)
It's not quite what you're describing, but you can join Open Invention Network for free:

https://openinventionnetwork.com/

Re:Patent Trolls Inbound: Our First Lawsuit by remram on Thursday August 25, 2022 @08:50AM (#32593036)
This is about members not attacking each other, not about defending each other. It could be a first step towards that though.