There are egg people and onion people. Egg people are knowable once you break the shell, but with onion people there are many layers to peel. I’m one of those people who, despite being outgoing, are hard to know in real life because I communicate much more easily through writing. Friends have told me it’s through my posts that they learn there’s a whole other side of me.
Yes I could start a blog or send emails, but everyone knows it’s not the same.
To me there’s inhererent utility in a platform like Facebook for introverts. If there was another platform that’s as widely accepted I would switch but due to the objective function to monetize, any company going down this path will be faced with the same ethical challenges.