Riot, please, you need to do something about these account sellers.
I go to bots to have fun. To relax. To try out new builds maybe, or to get my first win if I can't get it in the first couple of tries in PvP (Or, you know, when I'm sick of waiting 20 minutes in queue because no one plays support and I refuse to trust randoms with carry roles). What I do NOT play 3v3 bots for is to lose to the damn things because literally every game is me vs 3 bots with 2 bots in my team that are coded specifically to feed as hard as physically possible so that the game ends as quickly as possible to rush the accounts to level 30 so they can sell them to people who have been banned. This is legitimately a giant, glaring issue, and has been since halfway through Season 5. I have searched the boards and there are tons of complaints about this. Why has nothing been done? It honestly cannot be that hard to just pack some kind of sniffer that detects something injecting directly into the game's code. Sure, this'll mess with people who use maps and stuff, but just make it ignore visual aspects and instead look at the game controls themselves. Because honestly? It won't be long before 80% of your player base is just bots farming new accounts so people can make real money off of your game
A good 88% of your players aren't Diamond-Challenger. Stop catering ONLY to them.
And hey, you never know, this might solve your rampant scripter issue that you guys seem to be having nowadays, as well.
HMMMM.
Time's running out, Riot. 
Edit: Attached is a video of the very next game I played after posting this. It shows how to tell when they're bots, what they do, and how difficult it could be to carry them and win, especially for someone who doesn't know what they're doing. Key things to note are; Lack of keystone, summoner icon, name (They all seem to be 'Name two letters Name' or 'Name + five random letters') , they only spent 450gp on a map that gives you 850 (Meaning the bots were intended for Rift but moved to Treeline as well), and they generally go to the same places at the same times and die about the same times as well. No sense of self preservation, just afk pushing and feeding to get the game over with to level up their accounts. -
