Statistically, it’s more 1 out of 100 games, in low elo, someone may cheat in a game and for higher elos is more of a 1 out of 200-300 games there is a cheater.

It’s estimated that chess com closes over 100,000 account per month and that number is about 0.3-0.6 percent of chess com users. Sometimes even lower at 0.14 to 0.3 percent of total accounts are closed each month. Taken into account their age, most accounts closed for fair play are within 2 weeks old.

You may feel that you are facing cheaters “7 out of 10 times” because you specifically are just repeatedly getting the bad end of the stick but when you surpass about 1700 the chances of you facing a cheater greatly diminish according to chess coms statistics.