About 95% of the time that I quit out of an invasion (instead of the game crashing, which counts the same) it’s because it’s the same green spamming team that I’ve faced a million times before and is just no fun to play against. I play, and lose, to plenty of challenging teams. But they’re unique and they don’t rely on basically broken AI behaviour.
I have heard that from a lot of people. So, I think you’re fine making a hard team as long as it’s not one of a handful of well known teams that people are just sick of because they’re no fun to play against.
I’d probably quit playing if writing counted against you. Not because of writing out of webspinner rounds, though. I’d gladly pay a trophy not to have to sit through that. But because most of the time it’s the app crashing. If I got punished for a bug or it eating all available memory? That would be really user hostile.