As for this, these are heavily bloated numbers. AFK/dc are really rare, i’d say 5% per team at most. Not to mention, games are still winnable even with a bot.
And feeder? How do you exactly define that? Dying 10 times doesn’t mean you’re playing bad (well obviously, not that good either), definitely not bad enough to be throwing the game on your own. That would only be true if the person is dying intentionally (maybe even strategically picking the worst possible time to die) to sabotage the game, but, again, that’s excessively rare (a lot rarer than afk).
If one dies 10 times on liming trying to wipe the entire enemy team on his own, is he throwing? What about when he succeeds in that lategame and instawins the game?
Not a great strategy, especially if you’re already ahead in a game and then do that; but, hey, it’s a big play strategy and it can pay off. I’m not a fan of gambling when there’s no reason to, but it’s one way to play the game. If you have a teammate like that, you just play along. It doesn’t mean that having him on your team is a “guaranteed” loss.
A leoric might die 15 times to kill a keep. Is that intentional feeding? Maybe, or maybe it’s just a strategy and actually contributes to winning (obviously that’s not a very successful strategy and doing it without dying would be a lot better).
And if you keep getting picks on the same enemy over and over again (say 10 times in a row early-mid game), is that a guaranteed win? What about when that person goes “mmmkay, it’s lategame and we can lose now if I die first again, so enough goofing around, time to play serious” aaand suddenly your ‘free win’ is out the window and you have to work for it. Let’s say it’s a 50/50 at this point, so if the “feeder” team loses now, it might look like they were destined to that 100% loss, but in reality it was a 50/50, it just didn’t go their way that time.
If some1 only plays well lategame, then his mid-early game will often look really bad, but he will still win his 50% of games (well, when he gets to his correct mmr), but to the others he would look like he’s throwing every single game (because of playing really badly early-mid game, which matters a lot less than lategame).
On the other hand, a more typical extreme player is one who focuses really hard early-mid game, plays really well and then gets tired and consistently blunders lategame. He looks great on the stat page, but he just consistently throws games. He will, of course, also win his 50% games when he gets to his mmr.
Most ppl would consider the first player a feeder/thrower and the 2nd one a “good” player, while in reality they’re equal and maybe the 2nd one actually fits the “thrower” tag even better (because doing big mistakes lategame are really “throws”).
Those are of course extreme examples and there not that many players who consistently fit the bill, but that just illustrates how it’s impossible to tell why a particular certain game was won/lost.