As always this is an ongoing war with the bots. Our hacks team work on ways to detect and ban them, and the bot makers work on ways to avoid the detection.
While as a player travelling the world you may easily run into and spot these characters, it’s not realistically viable for Game Masters to actively police every realm / every zone and search for these bots, which is why the “report player” tool is also important. It does take multiple players reporting for the reports to be investigated though.
Although Game Masters cannot accept videos or other attachments as evidence, this is something that can still be forwarded to the hacks team via the hacks@blizzard.com email
Blizzard does care greatly about stopping these accounts, and continues to investigate and action regularly.