It depends on the receiver. Some have 1000 sats some allow any amount, some can attach a message

On twitter everything is public as well. That's the poi?t

Fix Typos: That's only way how it can scale. Similar to DNS. You need two types of relays. First your primary relay (or a few of them) for content you create. Then filtering relay which caches and can search notes from people you follow aggregated from their respective primary relays. Filtering or caching relays can be ephemeral each user needs to keep their original content on their primary relay.

That's only way how it can scale. Similar to DNS. You need to typed of relays. First your primary relay (or a few of them) for content you create. Then filtering relay which cashes and can search notes from people you follow aggregated from their respective primary relays.

Isn't payjoin obvious like reverse peelchain that merchant just accumulates payments into ever growing UTXO?

Of course it won't. He didn't pay 40 billion to become just one node on an open protocol