I've observed for a while that this game "encourages" smurfing. Even streamers do that.
Last example that I've seen was Tarik playing on an asc 1 account with Nadeshot. Also somehow my YT feed is polluted with "Road to radiant using gun X/Y", and many of the matches in those videos are on diamond 1 max. Why does this game allow this BS?
I even have friends/acquittances that play on many accounts depending on whom they are playing with.
Valve for example banned many dota 2 pro players smurf accounts. There, the pros were playing with smurf accs to not wait 15+ mins in queue for a game, and even those smurfs were max 1 rank below their main (in Dota max rank is immortal with ELO, and many were either Divine 5, aka prev rank before Immo, or low ELO immortal).