It would seem possible to me that if power was distributed widely over competitors it might be even harder to defend against, as fake news drives clicks which drives market share, everything about combatting fake news has been extremely polarizing (see this thread) and might drive bad PR to companies that take it seriously, a more diverse landscape might lead to a much more complicated regulatory landscape across competing products, and just a basic bystander effect of each executive team being more able to shirk responsibility because other people are too.
If I could propose anything, it'd be that we stop letting outrage and clicks drive our political machine, but we all know that will never happen.
A centralized source of power means a single target is all that is needed for manipulation to be effective. This is the basic premise behind decentralization in the first place.
Widely disturbed power is difficult to manipulate consistently without the manipulation becoming more easily visible, usually in the form of uncanny movement of many independent units as one, which most people can detect as suspicious.
The topics they brought up were left vs right, democrat vs republican, Conservatism vs progressive, women vs men, white vs black, poor vs rich, Hillary vs Trump, immigration, trade policy, globalization, brexit, Hillary campaign points, polling data and the failure of accuracy in it. A bit about net neutrality, regulations and taxes.
Project Veritas video directly say that Google executive Jen Gennai want to influence the next US election. The leaked 'all-hands' video from the Google leadership show that their political position is internally stated as democrat. Combined it gives us a very strong implication that Google might try to influence the next election.
National elections would be better off with less outside influence, be that other nations or companies that holds so much power, money and influence to rival nations. It would be great if Google, Twitter, and Facebook worked on removing information bubbles, bots and trolls, but I would not cheer if they simply replaced Russia as a force that influence national elections all over the world.
Aside from that, Russians spending $100,000 in a presidential race that cost $2,000,000,000 is just 1-part-per-20000. It's less than Bill got for his speech. It's just 0.005% of the total. That could be the personal project of a sufficiently dedicated non-wealthy individual. It's lost in the noise.
Wasn't that the main job of the FBI and CIA, two agencies with budgets that dwarf reason? These agencies' responsibilities are completely lacking from the public discourse.
Instead it looks like they ignored it at best.