Besides not being able to scale.

• Excessive network usage - over 10x compared to activitypub
• Relays auto-deleting old posts
• No actual blocking implemented - only client side
• Post editing doesn’t always work
• Notifications and posts getting lost between clients
• No moderation for scammers or trolls
• Unable to block people from following
• Metadata leaks - like everyone knows who you muted

I ended up having to block the word Bitcoin. It’s just too much.