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Definitely looks like a spam campaign. So far all accounts signed up from the same ISP. Here's a script you can paste in your rails console to find all users from IP ranges belonging to that ISP (assuming I didn't miss any):

https://gist.githubusercontent.com/patf/fc2e65007562d403181c33b418fff045/raw/1d66d75c7f00ef8f73eae5a83a99514cd04c525f/naughty_list.rb

To get to the rails console, run this in /home/mastodon/live as the mastodon user:

RAILS_ENV=production bundle exec rails c

You might also want to temporarily ban those IP ranges if the sign-ups don't stop. I did.

#mastoadmin