re email - would be better to create a pm for those using the platform, so that you can encrypt and keep their messages private (did you see the article a few weeks ago about Discord selling data -chats, emails, ip and names)? Telegram did it a while back and their customers abandoned them, so they are now very careful to to sell data...but people are still wary of using them.

For instance, if you said, we are charging you 20c a month, $2.40 a year, so that we have a contract which spells out that we do not have the right to share your data with anyone and you could sue us if we did....I bet many would subscribe. I would.