I think every government should be providing email service the same way they provide physical mail service. With all the rights currently given to physical mail.
We’ve tried that in Germany. The De-Mail was already dead when it was born.
They already are:
https://bsky.app/profile/rustfoundation.org
When Firefox announced they were on Bluesky, the comments here were the opposite: Why another corpo walled garden and not the real Fediverse?
I haven’t found the announcement itself, but replies by Tumblr mentioning it.
Essentially, almost nobody ever used it, not even all offices and authorities.