It is interesting to see how desperate some spambots are: I had a few registering on Friendica, noticing that pre-approval is active, and sending a message to the admin that "if you need super cash opportunity this is your chance"...

I can imagine their suprised face when their account was insta-deleted.
"How?! HOW?? How can these damned admins figure out that I am a spammer?!?"