they absolutely ruin the game
i have several and am guilty of being part of that problem.
alts = ranks that should have x ppl now have x+1 times more sr to disperse
costing people time energy and frustration to surf thru
it ofc encourages more trolling more disposable games
and is more amplified by the blatant mmr rigging
where alts fight alts etc
sum1 already did the math on it:
solution is to paywall them out of comp
use proceeds to make actual seasons and resets and hire agents