I think he blocked all or almost all of the ForSmash accounts.
Steve has been noticed; even though it wasn't spam, it was just a random guy tagging Harada in a group-collab thing for some reason, according to AkiraForSmash. I know SteveForSmash wasn’t spamming, and the others don’t seem like they’d do that, either. Really you could just check their tweets.
But I guess he's messing around, anyway? Or if not, Sakurai probably wouldn't really take this into account. It just shows more characters that would, as he said, “please the fans” and they come from popular franchises, too.