alt Hacker NewsI get that you don't like Twitter/Facebook/Reddit or whatever, but a clear solution to this problem is to hurt googles public image as much as you can and for that you need a platform with as large of a reach as possible.
edit: they have X but didn't post it there https://x.com/GrapheneOS
They post on Twitter more than anywhere else. This was a reply not a announcement or post. There are likely similar replies to this on their Twitter. Their communication is a goldmine for privacy and security info so even replies can be interesting enough to start discussion.
They have official chatrooms on Matrix and Discord and a forum on their website. They have unofficial (but run by them) chatrooms on SimpleX and Telegram and maybe other platforms idk.
They are not about avoiding big tech specifically, they make practical choices to improve privacy and security of their users.
Here's a statement with some ethos.
https://nitter.net/GrapheneOS/status/2044440381803069778#m