> I’m not persuaded that this all constitutes a conflation; it appears the only distinction is that Twitter is acting legally and Russia is presumably acting illegally (and I’m not sure they are acting illegally), but I’m not convinced that this distinction is a meaningful distinction

I don't think this is the right distinction. I think it might help to drill down on legal vs. legitimate, and what we mean by affecting/meddling/influencing/manipulating/corrupting/etc.

1. Let's say you install a little free library (https://en.wikipedia.org/wiki/Little_Free_Library) at the edge of your property and put a dozen of your favorite history books in it. The general understanding is that anyone who walks by is free to take/leave a book. Over time, many books come and go. Sci-fi. Poetry. How-to-draw. Self-help. Pop-sci. An occasional religious text.

A few months later, you notice that of your neighbors, who belongs to a minority religious sect, has started visiting every day. Each time, they take a book and leave one promoting their religion. This doesn't bother you much at first, but you get annoyed when you notice they've replaced most of the library and grow increasingly convinced they don't even read the books they take.

In turn, you throw out the books they've left so far, put in several more of your own history books, and toss any new books they leave once a week. They notice this in turn, and start telling people that you are discriminating against their religion.

The question of whether it's "legal" for them to do this, or "legal" for you to throw out the books they left is in the weeds.

I think better questions are whether they have any legitimate right to turn your little library into an advertisement for their religion, and whether you have a legitimate interest in curating your little library to keep them from doing so. No one else has a legitimate right to repurpose your library, even if every individual action they take otherwise follows the conventions of how free libraries work. It doesn't matter if they do it intentionally or accidentally, nor whether they have good or bad intentions.

2. Our democracy is a different sort of thing--more of a shared emergent process or relation than a thing. Almost everything has some impact on it, and everyone with a legitimate membership claim has a legitimate interest in influencing it. I have a legitimate right to influence it. You have a legitimate right to influence it. Other states and their citizens don't. Exactly which kinds of influence are fair/unfair has to get haggled out through ongoing social process. It gets even fuzzier when we're deciding what kinds of influence are fair for U.S.-based multinational companies. (e.g., are we only concerned about intentional "manipulation"? Is intentional manipulation with a small aggregate effect more or less important than a large inadvertent impact lying in the shadow of performance optimization heuristics that were necessary to keep the service up?)

Every multiverse incarnation of Twitter affects our democracy in some way. Twitter and every platform like it is a snowball of decisions made about UI/X, functionality/features, staffing, business/funding, management, accessibility, moderation, many of which get baked in long before a platform is anywhere near the scale it takes to even produce the emergent ripples that eventually get it labeled as powerful enough to corrupt a democracy. As long as it's legal to make platforms like this, they have a legitimate interest in deciding what their apps/platforms/service do and are for.

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Neither Russia nor the IRA have a legitimate right to repurpose Twitter or influence our democracy. Stopping them is not cut-and-dry, but I think it's more useful to see it as a nest of logistical/implementation problems. Twitter and many of its employees, at least as the rules of fair play are for now, have a legitimate interest in both making platform decisions, in influencing our democracy. It's fundamentally different because the solutions mostly involve doing democracy to figure out what is and isn't fair. There are some profoundly difficult questions here.