Bans?

How do bans work on this game for trainers etc? Is it that they will ban all new accounts you make once banned and rebuy the game?

Is there any way to change this to stop auto bans if that’s the case?

Banning appears to be random.
For instance I've not been banned even though I've used a trainer and used all the features available in said trainer and there are people who have been banned for seemingly doing the same thing.
I'm not going to be surprised when I get banned and it's only a matter of time, for now I can just have fun.
As for your question about auto-ban, It appears as if you can buy a new account and play like normal without issue. I doubt they'll blacklist you.

Just be careful to what extent you use your trainer. Try not to get too insane.