If it wasn't you, then all those accounts were controlled by one person or a group and they change the style of the bots.
I think only a very small number of people is involved in the big business of "bump bots", charging up to $1000 per thread per week. Many spambots changed to text spinners and later homograph attacks at the same time. That's quite stupid, as it made them easier to recognize. I have some hope that we made a big dent in their supply of fresh spam accounts, and that's why they keep changing their pattern.
I don't know what their latest pattern is though, but I'd like to continue hitting them.
BTW, the main blocker for me taking action was that I never got around to compiling the table of homographic characters and their ASCII counterparts. If this crops up again, it'd be helpful if someone would compile a nice plaintext "<char_from> -> <char_to>" table.
Homograph attacks are easy to get them banned. I've reported many of those accounts, saying: "Spambot/bumpbot doing a homograph attack. Please nuke.". That worked very well!
Since there isn't any legit use for homograph attacks, changing them back into normal text turns it back into plagiarism at best. Would it be possible to use "homograph attack" as <char_to>?
Example: "very" would turn into: "vhomograph attackrhomograph attack".
OK, we will try to assemble a table but in the meantime, can we just add them to the rules? So if we spot some just directly report them without trying to find a solid proof of plagiarisms?
There are only "unofficial rules", which can be bend by the Mods. Judging by the accounts that got nuked after reporting them, Mods already take action against it.