Seem to come in waves (Currently hasn't been one posted in a few hours). Not all that sophisticated either. Likely just one person that's got a automatic captcha solving system, creating accounts from randomly generated usernames and then has a script for posting.
The time of registration and when they post the content seem to be fairly consistent.
I guess that they are maybe the same Guys that are posting other Shady Things here like the Fake Anns with Malware.
The last months they are also doing that in Waves and there is already some kind of pause of there Posting Stuff.
But to be honest , i am latly very proud of the Community and a few Users here on the Forum for Reporting Things like that.
Keep up doing this Guys , Please !