nostr login should be the standard. All apps and websites hopefully cave eventually to this reality. Your example of cashu manages the stamping demonstrates my idea. Your app needs a monetary layer, and it would already be built in. You don't need to "support" cashu, you just need a standard plugin. If the user uses Fedi, your stamp is paid and the message is sent. A sat is a sat. You would be able to divert dev resources away from all the changes to the cashu protocol, and just maintain the payment protocol standard. It would free the user to select something they like better. There are users who would not use your product *because* you chose cashu. Down the road, if fedi "wins out" and cashu becomes marginalized, you would have to do some restructuring. I like standards and modularization. Its freedom increasing.