That being true and meaningful are two distinct things. That is true of anything that selects information to present to a user. Netflix recommendations, Facebook feed/ads/group recommendations, LinkedIn feed, Twitter feed, Reddit rankings, or search engine results. It could not be algorithmic and it could be mandatory editorial programming in a companies that run large numbers of local news stations.

What you said describes literally any technology that makes decisions about what to present to the user.

In my view, this is really the more important and unfortunately often underappreciated concern here. There's a lot of talk about what personal data might be captured by these apps/services (not to minimize that either), but it seems there's overall much less discussion about the potential for the control of information/ideas over large audiences, even in subtle but impactful ways. Not only is it plausible that such interference could happen, be it to exert political or economic influence, but it's likely that it could be done surreptitiously with little to no oversight by regulators, governments and ultimately the people using these services.

Yes, they could.

Funny you mention this, because an effort to purchase tickets to a high-profile campaign rally for Trump (and not attend, in an effort to make his rally look poorly attended) was conceived and organized through Tik-Tok. Not a Trump supporter by any means, but given that Trump is much more hostile to China than Biden, doesn't that explicitly seem like a situation that could be considered "foreign election meddling"?