The weird thing is that they post the links and afterwards they remove the posts in just a matter of 2,3 minutes. I don't think the mods are deleting the post otherwise the accounts should have been banned long ago.
There's a high probability that these posts are deleted by
Mitchell's bot,
MindlessElectron.
If you search for the user ID of any of these accounts in
modlog, you will find deleted posts.
I just searched for the user ID of the account you referred to in OP (using CTRL+F) in
modlog and found 55 posts.
loyce.club shows only 28 posts. (All these accounts have been created recently and loyce.club should have all of their posts)
Some posts are deleted so fast that even loyce.club cannot scrap them.
Also, if I'm not wrong, users cannot delete posts made in bounties before 24 hours.
That sounds like my bot, yes. It scrapes the Patrol page every minute or two (IIRC), so most of these spam posts are removed pretty quickly, as long as the bot knows what to look out for.
However, the bot does not nuke the accounts, just in case it was an innocent newbie. Most of the time the spam accounts are used between 1 and 3 times, so it's not too bad.
EDIT 06-01-2021: The bot now does nuke accounts for certain triggers.