Wrong. What’s happening right now with Trump as POTUS? Government is outsourcing totalitarianism. Time and again supporters of Trump are attacked by these Tech robberbarrons. It will be far worse with a Democrat POTUS even with no changes.
The tech oligarchs have no fear because they own Congress. Your “competition” idea is a liberatarian day dream. Goolag and Amazon are the modern day equivalents of Standard Oil. Without a firm response to their civil rights violations they will continue to assault conservatives.
Standard Oil destroyed competitors by ruthlessly cutting costs and selling oil products more cheaply. As lobbyists, of course they played the government where they could, but the government ate the oil business in the end. That made it more regulated, inefficient, expensive, and vulnerable to Middle East terrorists and dictators. Thank God for fracking, which despite interference by the states is re-setting the table.
But Trump could start his own platform, or rather, have his son do so. It's the only way out of this situation. Government involvement corrupts, and businesses are very willing to use government corruption to their advantage. That's why the Deep State exists to begin with.
I don't understand the alarm at competing platforms. People have been getting infuriated at youtube and Gargle for a whole range of reasons. Another platform would have a massive publicity boost, and obviously the market is huge--bigger than youtube or its masters at Google can handle.