Blizzard appears to have a way to stop players cheating in Overwatch, and that is to stop the matches happening altogether. As part of a developer update, Game Director Jeff Kaplan has revealed that Blizzard will automatically shut down matches when it detects cheating.
It’s not certain how the cheating will be caught, so expect more details to be released on that soon. You won’t lose the SR points from a competitive match just because a ne’er-do-well joined your team and forced an abrupt ending.
Kaplan noted that the feature is active on PTR (Public Test Realm) servers, but didn’t say just when you could expect it to reach the general release.
Whether or not this approach deters cheaters will depend on how well it works. If it works as expected, it could make cheating a thing of the past, as there’s no point in playing dirty if you can’t finish any games.