You're trying to throw out the baby with the bath water here. People not doing what they say they're going to do is bad whether it's gambling or anything else. If there's an argument against gambling on Steemit it's not because one account happened to be a scam.

"This stuff will continue to reemerge" is a pretty big assumption, and this guy here didn't even make all that much from it, and it teaches people to be more careful and is harder to pull off next time someone tries.

Edit to add: I haven't myself looked at this closely enough to have an opinion whether he's scamming. Not relevant to my comment here but I just want to be clear that I'm not accusing him of a scam, I don't actually know.