Closer at least. Maybe if beyond that judges can still allow your submissio to more. Not ideal though... I haven't hosted a jam yet. How would you feel about that extra step?
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Well, from my perspective the annoyance would be the same whether it’s clicking “no” on the approval or just doing a normal disqualification the way it currently goes.
The real question is whether the approval step would serve as a disincentive for the spammers so that they wouldn’t even bother submitting in the first place. Hard to say without trying it.