I am surprised like you that alternatives haven't popped up to these vacuous platforms. I think that can be at least partially attributed to the soft monopoly of critical mass. It's not all that different from Cisco dominating networking in the 90s 00s for example or Microsoft back in the day.
Would anti-trust laws apply when they are squeezing out competitors, but customers and ideas? I don't know. I do know two things:
It is unhealthy for society and the human condition.
If these arrogant morons get their way, millions upon millions will be made subservient and destitute. The purveyors of this doom will not look inward but will blame others and exterminate them. It's horrible to envision but a big yawn re-run of a previous theme in human history.
Why is the combination of humility, perspective, understanding of history, and objectivity so hard to achieve?