[lrvick]

I assume user produce emails, payment information, potentially other PII, behavioral data, how long each user reads each post, etc that adtech companies will gladly pay for.

If the system were open source, decentralized, and/or if user PII was end to end encrypted then you could prove you literally lack the technical means to collect or sell data.

All data that is valuable and technically able to be sold, will eventually be sold.