Agree that direct LN payment might be a legal issue. Maybe the fact that _any_ interaction with a service requires micropayment would make it a non-issue? Or maybe a spam filter could just whitelist common big copyright reporters, and keep enforcing LN on everyone?

PoW only seems different, but practically no app would use user's device for that, PoW mining services would offer mining for a small payment (Blake is working on one), and apps will integrate those if network requires PoW. There is no way a normal user could compete w/ spammers on PoW, unless they can just buy from a provider. And so small reporters would have to use micropayments for PoW anyway.

I think we might be overthinking it a little at this point. Too much is unclear about how nostr evolves.