I wouldn't be comfortable setting up a service that relays private messages into peoples email accounts - I'm not even sure how this would address the fact that we do not want children receiving unsolicited private messages which we do not have the resources to monitor.
Secondly PM's were abused no end, spammers, trolls telling new users to try competitors software, abusive messages etc etc. From our POV, benefits not outweighed by costs. If someone wants to be found and contacted, they can list their social media profiles.
I'm allowed to give all my social media names (which I personally do not have, just to mention that), but I'm not allowed to configure a hidden mail address for forwarding of messages and I'm not even allowed to show at least a mail address publicly in my profile?
Where is the logic here??
For children's safety is much worse to publish a social media name than to configure a mail address that is not publicly shown and is not even existing by default.