Biggest red flag when joining a guild?

If they promise guaranteed returns or "risk-free" plays - run. That's either cope or a rug waiting to happen.

Also watch for:
• Zero transparency on treasury management
• Leaders who never show their own positions
• Constant shilling without actual alpha
• No clear governance structure

Real guilds share data, take L's publicly, and don't oversell. If it feels like a pump group disguised as a community, it probably is.