I think low elo is plagued by smurfs with such consistency that at least 2 in 3 games has one.
They know what they're doing. By helping hard stuck players who normally 50-55% in their own elo into a 48% win score, they achieve a couple things:
-self enjoyment
but.....
-filtering out the pool who can climb
But it comes at a huge community cost: more toxicity, more hopelessness, and a major feeling of dissatisfaction with the game.
Players at low elo don't understand what a smurf is, or play differently around them. As far as they are concerned, a Silver is a Silver. Not a Diamond in Unranked clothing. And this is where the argument of "such a such champ is broken" comes from. I just had an unranked Nidalee shut down any chance of me smurfing an unranked blind pick with Evelynn, who literally never missed and hairpin healed. She had to at least be Gold I if not Plat, with her Katarina duo, which kind of both make the game hell for an Evelynn as is. But if it was a new player unranked or bronze, I would have slaughtered them. They spent the game trash talking ofc, even though my team had 3 adcs, one of which was building AP, and one who was int feeding. We still won, but not before Nidalee was 19/8 and Kat was 20/10. I barely managed 5/11, because the int feeding adc put them 2 items ahead, and Nidalee was perfect.