Just read the last paragraph.
If used for criminal activity police can get the iCloud account and all other information about who the AirTag is linked to. I’m sure they try to obfuscate that as much as possible, but I’m pretty sure criminals who use those means will often get caught.
Then join a more general server. There are literally tons of small general servers. Join one where they’re friendly. If you want to look “under the hood” before joining there are apps like ice cubes that lets you look at the local feed of each server. That way you can see who’s posting.