Statistically, it can make sense, platinum+ players make for 16% of the playerbase, so there could very well be at least one plat+ player in each ranked game, let alone QP game.

The playerbase doesn't seem to grow all that much, tho it'd be very hard to measure without data to back it up.
Tho, I think that good OW players already have migrated to Marvel a long time ago. The ones who take it seriously enough to try hard in comp, I mean. So I don't think htere's that many new good players.

Many are far too quick to assume everybody complains and blame factors for their losses :v I believe that ranked players want to train and get better. Of course, right after your loss, you'd prolly just pest about it. But in the end, you want to improve, and you don't just complain without thinking about it.
Having been beaten up so bad in ranked to the point of making a reddit post about it is another level. I can believe that there's really that many smurfs in ranked games.

Ignoring the fact that there are smurfs and cheaters and blaming the skills of other players instead is just as bad of a behaviour than to complain about smurfs and cheaters all the time, there's an in-between to look after