User blog comment:Warwick-is-love/A little idea for ranked games.../@comment-7481207-20150706081827

The issue is that even if ranks are not shown for allies in the loading screen (enemies are already not shown), people still look those up on sites like LoLking and LoLskill. The only way to prevent that would be to completely deny these sites access to a player's ranking.

Also, replacing an AFK with a bot would be disastrous. If they improved its AI to match a normal player, then "bad players" would be pressured to leave so the team will get the better bot instead. And if they are worse, then just look at how ridiculously easy it is to snowball against intermediate bots.