But people already have Paypal and understand how to use it. Most people don’t understand cryptocurrency, and don’t want anything to do with it because of its association with scams.
At one point they didn't, and they had to sign up and learn how to use it. But your critique is fair. It's an optional feature, you don't have to use it. The benefit from the platform perspective is that the fees are stupid low so micropayments can work well. Like 1c on $5 low. And it makes it easier to do the payments internationally. Microtransaction tips really couldn't be done with Paypal or really any other competitive non-crypto system.
Also, I looked in to Nostr a bit for this and do you seriously think profile links like this will catch on with people?
The nostr username schema isn't great. There's a couple protocol proposals to simplify them, they will look a lot more like [email protected] in the future. AP currently is doing way better at this. I'll add this to the list in the post of places where AP is better.