Yes, bugs are used competitively but communities will often come to consensus on which bugs are allowed and which aren't.
I think for the most part when you see a bug it's easy to tell if it'll be acceptable for competitive use. Bugs that allow enable more counterplay or raise skill ceilings are usually fine. Bugs that give you an unfair advantage or go against the spirit of the game are usually not.
FWIW I think bugs in the latter bucket should be fixed asap. While you can forbid exploits in a tournament, these kinds of bugs can ruin ladder play.
Yes, bugs are used competitively but communities will often come to consensus on which bugs are allowed and which aren't.
I think for the most part when you see a bug it's easy to tell if it'll be acceptable for competitive use. Bugs that allow enable more counterplay or raise skill ceilings are usually fine. Bugs that give you an unfair advantage or go against the spirit of the game are usually not.
FWIW I think bugs in the latter bucket should be fixed asap. While you can forbid exploits in a tournament, these kinds of bugs can ruin ladder play.