The casino thing that's vogue right now. Just to confirm we're aware, it's still against policy to advertise a casino (https://us.support.blizzard.com/en/help/article/000227547) so keep reporting them (or dropping infernals on them).
Digging in, it looks like the RMT crowd (that's gold sellers) have realized this is an easy way to make gold quickly and cheaply, which has driven an uptick in the behavior.
You caught Watcher's attention so we have a few folks looking into ideas on how we can make getting these people out of the game much faster so the activity is less lucrative and in turn, they will hopefully piss off.
Don't expect any sort of big fanfare "Mission Accomplished!" banner for this one, this is one of the ones that you hopefully don't even notice stopped happening if we get it right.
While players wait for Blizzard's official plan to come to fruition, they have come up with their own, creative ways to deal with these pesky casino bots.
As Senior Game Producer, Tom Ellis, mentions in his post above, Warlocks are able to deal with these bots by simply casting Inferno and letting the Infernal run wild. However, players on the r/classicwow subreddit have come up with a plethora of other methods to temporarily deal with these bots, including the Swamp of Sorrows debuff, Rift Beacon, or bringing a Parasite from Netherstorm into a major city.
