Help me understand one thing

how come that an account that is in silver and has over 90% winrate isn't inmediately banned?

I understand that a player might learn quickly, I even understand that you might have made some mistakes on your placement games so you got placed a whole rank below, but how does a silver player suddenly obtains diamond mechanical skill? like seriously, a yasuo timing their ult with windwall and ADCs who orbwalk perfectly?

I'm a regular player who reached gold at the beginning of the season and I admit that my level is gold 5 at best, I got demoted heavily because I keep finding these people who seem to be WAY better at the game than I am, again, even though I'm below my best rank I keep getting matched against people who is heaps above my skill level... and not like "oh, I can orbwalk a bit better than you" no, it's more like "Even if I try, I can't stop orbwalking" and then you check their profile and they have like 20 games with the same score and adaptable builds O.o?

Doesn't having a bunch of games with crazy KDAs, CS and even wards tells you anything about a silver player? Is learning a switch that people have?

OBVIOUSLY NOT

Learning is a curve and people who improves ends up climbing but that's the point, how does a silver player suddenly jumps to diamond skill level?

Either smurfs OR boosters and the whole point of this thread is: Why is it that these type of accounts still remain active after so long? I understand that it's hard to prove but how many fair games will they skew in their favor?