> I'm sure they're others. But I think the key common thread is that all of them require censorship resistance. If what you're doing isn't likely to be censored by authorities then you're being incredibly wasteful by using blockchain

I don't think "censorship resistance" is the correct term. I think what you're really describing is "law enforcement resistance" (e.g. your activities are illegal).

And even in those cases, unless cryptocurrency is circulating as actual currency in the economy (which it isn't), most of the law-enforcement resistance is fatally compromised by the need for onramps and offramps.