Most of it sounds fine outside of the "some public figures".

What it needs its clear standards and no whiff of Twitter endorsing the account holder.

Government accounts and corporate accounts are pretty straight forward. Business partners seems unavoidable. Some room for debate over "major" media outlets, but honestly it won't hurt to apply it to as small a media outlet as is practical. I would definitely not give it to individual journalists.

The public figures, though, could easily just go back to the same problems if they don't watch it.