How to we repoet players with bought accounts?

Ive encountered a few, so Im starting to take notes on there names now. Now the proof that I have that there accounts are bought, is that they will have like a 75% win rate and be Gold 3+ Then, they would have dropped from diamond-Plat-Gold into Silver-Bronze. with like 100+ losses under there pelt form there latest win. EDIT: sorry for the title fuck up, my bad.
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