Inevitably I think bad or bad faith actors, the kind who were on Parler or in /r/Conservative that ban people with a counter-narrative will simply not use the platforms where they can't have full control to completely silence anyone they please.
It's why I'm fairly certain giving bad actors "free" access to the best technology is nonsense, you wouldn't give enemies your plans to your latest technological advances in weaponry - and the same goes now for the digital age.
The deplatforming done recently of Trump et al by multiple technology layers of private owned companies, was good overall to at least slow down their rallying and organization. Yes, it possibly inflamed some - but they quickly learned if you don't behave within the bounds of what's considered civilized behaviour that allows society to thrive and that these free companies of people, organized people, understand and have a solid foundation that they're holding the line for; contrast this to countries where there's a tyranny as a government that has their hands in all important companies to understand the importance of the ability for private companies to have this power to decide as a failsafe against government becoming a tyranny.