It's been like this for at least six months, bots level or farm ip in TT. I had hoped at 30 it wouldn't be so bad but it is. Generally if you're solo queuing bots outnumber actual players.
Riot doesn't care it's easy to pick the bots out they all use the same summoner icon and never have a final tree mastery. They could fix this situation so easily, they just don't care. I'm not a coder/developer but I have experience botting in other games, thereare sooooooooooooooooooo many ways to identify and subsequently ban them.
Either play it ranked, with a team, or better yet boycott TT altogether till riot decides that the opinions of their player base actually means something.
This entire situation is extremely frustrating because I love 3s, when they added champion mastery and ratings to it I was so happy.