BitcoinIsFuture on Nostr: That must be the highest cost that you outline which will be unsustainable for ...

That must be the highest cost that you outline which will be unsustainable for spammers. Filters work and Bitcoin Knots has the filters.

quoting
nevent1q…4e6t

For spam less than 150 bytes, here is the tier list:

Lowest cost option: unfiltered op_returns
Middle cost option: unspendable outputs
Highest cost option: private mempools

I support the filters because they push the cost of spam up the tier list