> aren't we really saying voters are not individual agents but rather a mob subject to manipulation by propaganda?

If you want to view it that way, sure. But I could also just say you and I are both sacks of blood filled flesh.

> Rather than tackle the narratives substantively,

Meta (et al) are just AS guilty as TikTok. The difference is substantial and subtle - the US government could conceivably sanction a US-based entity to the point of them not existing. A chinese based one doesnt have to play by the rules. Fine them? No problem, their gov has an immeasurable amount of money. The only option is to simply not let them play at all.