मुक्त

Lichess actually has some stuff not there on chess.com. One of the heavyweights in open source world.

Obsidian.

Big projects generally have their own websites to house their community. Example of LibreOffice comes to mind.

Obsidian?

are these issues replicable? documented?

Don’t be paranoid. They scans our chats against problematic keywords to find out bad guys, and metadata helps law enforcement in catching these bad guys. /s