The propaganda apparatus will adapt if that becomes common so its not a permanent solution but it's nice for now.

Yar.

I wonder how much more expensive per post it would be for the bad guys if social networks required the most draconian verification technology, like a hardware-based biometric system you have to rent, and touch or sit near when posting on social media. And maybe you have to read comments you want to post to a camera.

Even at such a ludicrous extreme, state actors would still find ways to pay people to astroturf. But how effective would extraordinary countermeasures like that be, I wonder.

(Also I think high global incomes would greatly mitigate the issue by reducing the number of people willing to pretend they genuinely hold views of foreign adversaries and risk treasony kinda charges.)