Good advice I got from colleagues at a 2000 era company who took out loans to buy their options and cover the taxes when the stock was at $50/share and then watched it drop to <$1/share while they were in a lockout window. I worked with people who had 6 figure loans they owed on for worthless stock. Took years for the stock to recover.
To answer your question, yes there are still companies that facilitate the secondary market for pre-IPO options, Forge/Sharespost is the one that immediately comes to mind.
In 2015, I talked to ESO fund for some fintech options I had where I couldn’t cover the tax when I quit (stock wasn’t public). I was very satisfied with my dealings with them. Ultimately, they pulled out on the deal. That was a pretty strong signal because, low and behold, that pre-ipo stock tanked in a month too. Luckily, the lessons I’d learned from the earlier stories helped me to walk away from those options. It was a tough, but ultimately good decision.
Greed by the taxman.
It would be a non-issue if the tax authorities collected the tax at the point those shares are converted to something else, or used as collateral to a loan. But to tax them without any ability for the employee to extract value from them - especially relevant for privately listed companies with glacially illiquid stock - is abhorrent.
But instead the taxman has to always be the first to eat the pie. Even if that pie never turned into anything real.
In the UK it is horrid- share options of any meaningful value are taxed at ~%63 (including all hidden National Insurance taxes) and it could be years before you can cash your shares, if at all.