My friend botted 99 att,str,def, and 98 range 24/7. He got a two days ban a month ago while botting range at yaks and quit botting because it would be a waste. Then went to do Pvm and quests with the intention to never bot again. But when he had to spin 5k flax to get 61 crafting for lunar (because bh was about to be released) he was lazy and used a bot. After 10 minutes of flax spinning he was perm banned.
So yeah I think they do watch accounts that have been caught botting once closely.