"It would be best to have a “subscription” feature built into a popular client such as @primal"

I agree, the function fits with content specialized apps. especially since they already have a build-in wallet. This makes it much easier to configure compared to connecting a 3rd party wallet through NWC.

"Typically subscribers would get access to content that others aren’t privy to, or at least access it earlier than others get it."

nostr:nprofile1qyd8wumn8ghj7enpdenxzun9wvhxummnw3erztnrdakj7qg4waehxw309aex2mrp0yhxgctdw4eju6t09uqzp47czz0wgdjhees9dtdyv5cqdwakg8e3u58g2fpks8p8y3g8sy0vf86jar build a function for this where notes containing content are decrypted upon LN payment.