What we're seeing is the Wal-Martification inherent to capitalism.

I don't mean this to offend but your instinct here, which is entirely relatable, is paralleled by the people whose political inclination is to try and wind back the clock to the 1950s or the Wild West or "before corporatism" (whatever the hell that's supposed to mean) etc.

Obviously the huge distinction here is that you haven't crafted your entire political analysis based on achieving a return to what was and you've accurately identified the political and economic forces at play that have caused things to develop in this way and you have a viable solution for the problem you've diagnosed. On the other hand, those groups have none.

The way that individual production and small-scale local production with small marketplaces that brought together groups with similar interests and some larger agora-like regional hubs gradually turned into increasingly larger corporate entities that vacuumed up all the small production, distribution, and exchange until all we're left with is tiny little farmer's markets existing within the margins between massive operations like Amazon, Wal-Mart, Costco etc. that are pretty much unavoidable today is nearly a 1:1 analogy for how the internet started and how it's going, except in classic internet fashion of course this was done as a speedrun.