Pretty naive take.
Blizzard took action against the stygia thing, because it was bypassing a timegate, which would have allowed people to unsub faster, which would decrease bobby koticks bonus.
Which is the same reason they take minimal action against bots. A bot who isn’t purged for weeks at a time, wil have farmed enough profit to just spin up a new account when they are eventually banned. It’s a symbiotic relationship for blizzard.
They do just enough to make it look like they’re doing something, without threatening that sweet sweet influx of cash, every time a new bot is spun up.