Twitch banned most of the Adult female streamers(also known as thots) for NSFW content.
Why do you think that Twitch won't ban the gambling streamers?
I'm not using Twitch anymore and I don't like that platform, but from my experience, Twitch is very slow when it comes to banning streamers that violate their Terms of Service. Maybe the platform is just too big and Twitch doesn't have a big enough team of moderators and customer support representatives that would effectively control all streamers. I'm sure that the gambling streamers will be banned in the long run.