> Require human moderation. That naturally limits scale.

Does it? Does a human need to examine everything posted? You can certainly send letters without them going through a human moderator. Only what is flagged by a scanner? What if nothing is flagged? What should be flagged?

> Does it? Does a human need to examine everything posted? You can certainly send letters without them going through a human moderator.

Because those are two orthogonal things. You aren’t sending a letter to be displayed by everyone and their dog on this planet to see.

You can also print flyers, pamphlets, books, posters, and all such things without submitting them to a human censor (c.f. https://internetshakespeare.uvic.ca/Library/SLT/literature/p... for this usage).

Yes. To one address at a time. If you do a mass send, you'll get regulated at some point, too.

It raises the cost of the service therefore the need of user data monetization, I feel like this would backfire. I’d limit the revenue via bans on ads and data monetization.

great way to burn out people and scar them for life, look at all the stories of facebook moderators etc.

Nah, they would use AI, and as such, would not really limit scale.