When I received my stock options for the company I paid no taxes at all. When I exercised them I got a tax hit, but that had to be paid like six months later so there was no issue selling enough stock to pay the tax.
Another funny thing about wealth creation. Norway and Sweden has more dollar billionaires pr capita than the US [1].
[1] https://en.wikipedia.org/wiki/List_of_countries_by_the_numbe... (sort the list by Population pr one billionaire).
Source: Have exercised stock options in a Norwegian startup. I was lucky enough to have enough cash at hand to pay the tax.
I wouldn't exercise unless I knew I could sell it of course, then I'd be in a pickle or would have had to borrow until I could sell!
I read most of this: https://www.skatteverket.se/privat/skatter/vardepapper/omakt...
Why exercise the options if you have no ability to sell them? The risk of unexercised options is totally on the employer who granted the options.
For the employee, holding the option itself is likely a lower risk strategy than exercising and holding the illiquid stock.