Bots have never been gone. Just because there are not public and commercial bots doesn't mean there are none. People will always try and breach through battleeye to gain an advantage. You can just develop a little private tool which is unknown to the algorithm. At some point it will get picked up though and be blocked again which leads to either deletion or a huge waste of time for the developer.
The big era of botting is over but people will always try to plain unfair and find ways to at least temporarily do it.