Listen man, i have consistently played this game for 6 months and can't recall a single time that i have seen a bot in ranked. I am not kidding. Maybe it's because of my rank, i don't know cause I'm probably slightly above average. When i started i was g1 and now I'm g3-p1 exclusively solo queueing as support and the rare time that i queue a dps roamer, i sit in p1.
90% of my games are in unranked because it's no pressure, i don't get tilted, and i like to meme around with off meta builds. I have a lot of fun in unranked even though there isn't a substantial gold reward from playing unranked. If you want some advice, play unranked cause there aren't any bots farming gold.