I understand the motivation. However, how do you suggest this be accomplished? Official accounts would be replaced by surrogates. And how do you distinguish between individuals and surrogates or proxies?

We have managed to keep spam out of inboxes haven't we? When is the last time you saw something slip through?

There is 10 years of training data out there, which should cover everything most politicians and journalists are ever capable of coming up with.

If that were to work reliably, wouldn't that also catch political expression from individuals (as opposed to just politicians and journalists)? Or are you targeting political speech in general? Perhaps I'm misunderstanding what the end-goal is.

Yes it would. I doubt too badly though. How often is actual mail getting misidentified as spam?

Plus the quality of political expression imho on these platforms has gotten so low in terms of signal to noise that I don't think it would be a great loss to society.

The speed and reach of a message on social media today is unprecedented. Such platforms need ways to retard the flow of ignorance. That would really be the goal. And there is enough evidence to show that journalists and politicians are benefiting the most from such flows.

Don't allow politician to communicate directly with the people? I don't think that's such a good idea.