Like I said, if you have a sauna in your home and the time to use it, you’re rich enough that the above holds true. Whether that’s most people or a only few.
It was carefully explained how in the country where experiments were held, this technology is accessible to all but the most poor.
This hardly qualifies as rich by any measure.
During hospital stays you probably do not have the chance due to health and hygiene reasons.
Like the parent posts already said, if you live in Finland you definitely have the means and time to use a sauna.