Good point.
There are also the treatment of public utilities that are monopolies.
How ironic that a private baker can be fined for not putting a gay message on a cake, but an open public forum is not punished for prejudicial editing and blocking.
I know, its nuts.
But the public utility is also a good example. The electric company cant shut off your power because they dont like your business.
Its not quite as similar to the situation where the courts have ruled that private property can be a public forum, but its very important.
Today it is Facebook, YouTube and Twitter. Gmail is also doing it. Google, Amazon, Microsoft and Apple are starting to do it. PayPal, and other formats are doing it. Some of those fall under public forum / town square use and some dont.