The problem is there's barely any discussion with these people who are being manipulated, incited to violence, due to the online bubbles they create. This inevitably leads their communities being banished and having to migrate elsewhere - where they can freely speak with whatever hateful, violence provoking or inciting comments they want - and they'll continue to more strongly resonate in their echo chamber until they're incited to violence by someone like Trump et al.
I also don't understand what tech companies are preventing from being discussed? The issue with Parler is they weren't moderating to delete violence inciting commentary - if Parler had done an adequate job of that then the app would still be accessible on those app stores.
More government control leads us more towards a CCP state, whereas the freedom of businesses to be relatively sovereign is a failsafe against potential tyranny - and where people are "voting" for the companies they support the governance of by buying their products, services - allowing them to earn revenues/profit to continue existing; yes, there needs to be even more competition to prevent oligopoly behaviour, and there is policy possible to help with that - especially what's needed is good data and network portability laws so people's online life is easily mobile, as well I believe there needs to be a mechanism that extracts more value from businesses that gain benefit from economies of scale for various reasons.