You could even go so far as to say that third spaces that are tied to political, religious, or other types of groups are "monetized" in the sense that they exist to further the cause of growing that group.
What's nearly extinct is neutral third spaces with zero agenda.
I suppose parks (national, provincial/state, or just local) and libraries are neutral.
Perhaps this was always true, but it seems for a brief time places like shopping malls were not as concerned as much somehow with having purely immediately profitable people inside and that’s why they were able to be that third place.
Hopefully in time a new generation of voters will want to fund more third places with taxes, because that seems to be the way to get long lasting third places that really do serve their purpose without an agenda.
What's nearly extinct is neutral third spaces with zero agenda.