The freedom to assemble doesn't mean that private owners can't keep you from assembling on their property. The freedom of press doesn't mean that the editors can't censor your work. The freedom to bear arms doesn't mean that private businesses can't bar you from the premises.
Which means, in practice, that people can't necessarily use those freedoms. If most or all public spaces are privately-owned how do you exercise your freedom to assemble? Now that most of the communication channels people use are privately owned, how much freedom of speech do we really have?
Actual freedoms themselves don't work that way, just the codifications of them in the US "Bill of Rights". Given what was discovered about complexity-induced logical contradictions in the 1930's and the subsequent wholesale implementation of such, this should be considered a P0 bug.
The freedom to assemble doesn't mean that private owners can't keep you from assembling on their property. The freedom of press doesn't mean that the editors can't censor your work. The freedom to bear arms doesn't mean that private businesses can't bar you from the premises.