Smurfing was pretty bananas in Rocket League too.
Mixed that with people convinced they should be ranked much higher and the only thing holding them back was their teammates and yes that could be pretty toxic too.
I once unknowingly let my nephew play ranked on my account and I had to rank back up from gold, which is the closest I’ve come to smurfing.
It was only a few games until the mmr leveled out, but the gold games were honestly harder than plat or diamond because of how many people don’t even have the self-awareness to know they’re messing up.
I mean, I’m messing up all the time too, I just don’t need to blame my teammates.

That said, I haven’t played much since Epic got their hands on it.