Because "muh free market".

Even in 2020, both conservatives and liberals (the non-radicals on both sides) still cling to the idea of lack of regulation being a good thing, despite decades of evidence to the contrary.

The liberals are softening on this because they don't counter-signal the radicals on their side, while the conservatives actively demonize the radicals on theirs.

As a result, only one radical fraction of one half of the political duopoly actually has both the desire and energy to enact this kind of legislation, and that isn't enough.