Automation, 3d printing, AI and remote office work all put a wrench in their mass depopulation, only for whites though ofc, scheme. These things all make monolithic megacorps pointless, hence why they're scrambling to strangle them legally and bureaucratically, and by extension made the whole "everyone relies on a handful of companies" plan is falling apart. People like Amazon will be replaced by personally owned delivery bots, mass retail is more or less on the way out already and the "big tech", actually big media but let's not split hairs, exodus is happening right now. This transition will probably take the rest of the century but you can bet your ass it's happening.

In their neverending chase to become more efficient they just made the tools necessary seal their own obsolescence.