They are operating on a DARPA created platform, the internet
Does that mean the whole internet is public space, and all sites therein are operating in a public space and don't have private property rights to choose to do things as they want?
Companies receive funding at time in the real world, and people can protest on public land, but not on their property. Anyone can make a site in the public internet to speak as they want. But other people's property of their sites get to determine if they want to allow you to enter or not.
all are funded by government funds
Does that mean everyone who receives federal funding becomes publicly beholden?
It doesn't hold up to me...
I think this is a bit besides the point. See my reply to @valued-customer regarding the absence of the rule of law and how these social behemoths should be broken up under anti-trust laws, as they are obviously abusing their power to censor public fora for political gain/alignment.
A public forum paid for with government funds must be obligated to observe the obvious right of the sovereign people speaking there. All the FAANGs, as well as the enemedia like CNN, spend taxes forcibly taken from the people, and have no right to spend those funds to censor us contrary to the clear specification of government power in the Constitution.
Government has no rights, and no power is delegated to it lawfully to censor we rulers of ourselves. Spending funds received from government to create censored public fora is unconstitutional for very good reason.
It's not that receiving food stamps makes you publicly beholden. It's that using government funds to create a public forum does make you beholden to the rules restricting government from censoring the speech of the public. Even if those funds are attempted to be - indeed, even more importantly - covertly distributed to the fora.