You are correct of course: adoption (and the network effect) is the strength of Big Tech (BT). But it is also their Achilles heel. Without users these platforms are toast! And users sign on voluntarily & can leave at the drop of a hat.
A second weakness is the possibility that as government tries to co-opt BT more and more the 2 camps will fall out. We are already seeing signs of this in the current "misinformation" campaign, where Facebook executives, fed up with ever more stringent demands from the government to cancel "misinformation" have countered that government is using them as a scapegoat for its own shortcomings. I am in the (ICT) business and I can tell you that managing Human Resources or Customer Service is definitely not the strong point of the little nerdheads who run these BT platforms; and ploughing through individual posts to identify whatever currently passes for "hate" or "xyz" is definitely a big No No. That would mean real work for no return! These guys like to automate things with algorithms. But algorithms don't always work as designed. And the more they are employed the greater the chance of ordinary users being impacted negatively. As a PR gesture a BT company will throw a few million into a unit employing cheap (slave) labour in places like the Philippines to do some manual monitoring. But their heart is not in it. After all, cancelling too many users destroys their entire business model! Everyone knows, for example, that Facebook & Twitter made a mint out of the Trump campaign back in 2016.
Another breakpoint is that changing government demands are extremely irksome. Our nerdy friends in BT need to be told exactly, precisely, specifically-to-a-T, what an "extremist" or a "conspiracy theory" is; or what type of user they should impede with things like unsaved data and suchlike (if people only knew what went on behind the scenes they would be attacking BT offices with pitchforks!). Most of these people not only have the moral compass of a rabid dog, but they also don't like change which translates to work! A U-turn like the lab-leak theory, for example, when last year's rabid conspiracy theory became this year's to-be-promoted "in-item", is not only work but can shatter the confidence of the fragile little souls programming the algorithms. All bad for business. Not everyone out there is stupid.
Finally exposure of BT practices by well-known public figures can be very effective in moving public opinion. Elon Musk's badmouthing of WhatsApp new "terms of service" back in January resulted in a large-scale haemorrhaging of users to Telegram & Signal. So there is hope.
P.S. I shall address your question "anybody has a solution to this" in another post if time.