It's quite strange, I had only me and my wife on my social site. Some time there were some registrations like johnDoe12344324@gmail.com, I accepted them knowing nothing. They didn't reply my welcome email, didn't post anything, just left a description with references to some students papers writing sites. Checking them again I removed their accounts - I don't want to support education system sabotaging activities or advertisement in any form.
Now I have 2 new registration requests, mailboxes names are johnsmith234234 and whateverpaperedit. I sent them welcoming emails asking to tell why do they want to have an account on my server and telling that I will remove whatever AD bullshit they made up on my site. They still didn't reply.
What's the matter with those paper writing services? What are they trying to find here, on Hubzilla? I thought our community was yet small and very specific for this kind of crap. And how long do you usually wait for a person to reply your email until you reject registration request?