Doing a runner means breaking the contract. That alone justifies the runner being blacklisted.

Of course, if the school overworks you and underpays you, puts you in an accomodation that is below the quality stated in the contract, and makes you do extra activities without paying that makes it A OKAY right?! No matter HOW MANY RULES THE school/company breaks it doesn't matter, right?! Are you really a foreign teacher??

Boozer Fts in China deserve being blacklisted too, despite there being too many of them here.

Sure, as long as they're not your DOS or Director, lest you risk getting your contract terminated and blacklisted yourself!

You sound a bit naive to say the least. But I wonder if you're one of those chinese owners who benefits from this ESL scam in the first place...