The next 20 years will see a fascinating evolution in this space. Nobody should think that competition is over, or that these platforms have won. These issues should feel very exciting to folks in technology.
Twitter still refuses to publicly state how many of its users are bots largely because it knows the financial implications for doing so.
Facebook has released the bare minimum amount of information related to Russian interference, despite reports that its still ongoing.
What does competition look like against these companies when the financial incentives encourage more consumer data gathering, not less?
I agree with the parent comment in that - Google and Facebook and the like have exposed some serious problems, that they can't fix (as they are financially incentivized not to fix them), so someone, someday will come along and eat their lunch? Who what when where and why? Your guess is as good as mine.