I believe the premise of the title. But the main question should be: why? And the article does not really answer that, well beyond censorship. I think the reason why centralization is a danger to democracy, is because of lobbying. Lobbying is much easier in a centralized power structure. See how much lobbying goes on in and around the power centers of this world: DC, Brussels, London. Lobby is power for money, democr…
Democracies are incompatible with censorship.
> Currently lobbies have more power in the decision process than voters (any political sciences professor will agree). So democracy is a hollow word, or worse: a facade, a lie.
I agree that lobbies have far more power than citizens, and that this is a problem. However, maybe I'm misreading you, but it seems like you might be implying that since we don't have democracy anyway, censorship is fine? Of course, that's not true; we don't want to actively invest in preventing ourselves from getting back to something we can meaningfully call "democracy" by way of legitimizing censorship. Again, probably not your intended meaning, but I wanted to address it anyway.
While we're talking about corporations having too much power, let's talk about social media companies--they can influence our society directly. They don't have to pay people to petition congress on their behalf; they can pay Twitter and Facebook for access (think "Social Dilemma"). Indeed, they have so much power that we were concerned circa 2017 that the Russians were able to indirectly use their influence over us to corrupt the 2016 POTUS election; how much more influence must Twitter and Facebook (and now Chinese-owned TikTok) have over our democracy given that they have direct access to those algorithmic levers? The super rich can now lobby and pay Twitter/Facebook/etc in order to pass their policies.