> I am surprised the space casino hasn't been done to be honest. Or some kind of space resort.
The ISS is the single most expensive thing built by humankind ($100b+). What makes you think that building a "space casino" or "space resort" is commercially viable?
Without getting into the weeds, I don't think it would be commercially viable, but that doesn't seem to be a prerequisite for funding these days.
I would also note that the ISS is a very expensive long term project, a greenfields space station like Tiangong from my understanding was about a 10th of the cost. One of these billionaires could pay for the whole thing out of pocket.
The ISS is the single most expensive thing built by humankind ($100b+). What makes you think that building a "space casino" or "space resort" is commercially viable?