Not only that, but proof that the "platform" or one of its employees didn't go rogue and write a message on their behalf. Users retain their keys for signing
Discussion
Agreed, it will also incentivize people to actually own what they say because you can’t delete it and it’s tied to your identity if you’re choosing to be in the public square. It aligns incentives for people to think more carefully about what they say because they won’t be able to pass it off as an intern if it comes from their pub key.