Celata on Nostr: Email was built using free labor and runs at no cost to the user in the vast majority ...

Email was built using free labor and runs at no cost to the user in the vast majority of cases. The value of the email ecosystem is that it allows you to communicate. You can see it as "depending on volunteer labor" if you like but that's completely missing the point. It doesn't need an economic model to succeed, it just needs to be useful.