The term "Too Big To Fail" is probably inappropriate here (was it ever appropriate actually? banks should have been allowed to fail in 2008), indeed Facebook may well be replaced at some point (is Gen Z even on Facebook?), and AI might well replace Google's killer product: its search engine.

This said, I tend to agree with you, the power law exists and has to be maintained by big tech to control the content because a captive audience is soooo profitable.