Sad to hear!
A ban can always happen while botting, unfortunately that's the risk we take
Some never get banned, some get banned quick. hunders of variables that play in that equation and often impossible to see what the exact reason was.
But often it starts happening when people try to get too greedy and try to rush something too fast. Botting a lot of hours in methods that require high focus, etc
I always say: It's is not a sprint, it's a marathon.