I don't think you'd ever be able to enforce it.

Can't squeeze blood from a stone and I doubt the LN wallets allow for a negative balance. I keep a small holding in my SN wallet, everything else is moved to other wallets.

If you tried to punish or penalise my posts, I'd just leave enough to post in my SN wallet and then move the rest. If my SN wallet balance is 0. You kinda can't take any from me.

I get where you're coming from, would love a way to incentivise not posting shit. If there's a risk of losing sats, I think there would be a lot of posts/posters who would think twice about posting. But ultimately, bad posts just don't get zapped.