No, you opt-in. People can still send you ecash due to the mere fact that you have an npub, you can always choose to not redeem them

thx for the answer, but I see that kind of problematic in some cases. we all want nostr to grow, right? with that you will also get officials (politicians, CEOs etc.) on here that might be in a jurisdiction that doesn't allow them to take (let's call it) donations... just my thoughts on this