>
Thiel bought his shares at $0.001/share in the same round where the company was valued at $0.20/share.The strike price and the "fair market value" are often different so there's nothing exceptional or even unique there. Odds are, half the people reading this thread have had the same situation in their careers. The difference is that this company (Paypal) ended up working so those shares became valuable.
If you or I did it, we'd pay the strike price, it'd be reported to the IRS at the FMV, and we'd pay the tax on the difference. In this case, it would be some percent (22? 25?) of 1.7M*(0.20-0.001) or ~$338k.
Of course, from there you get into the "unrealized gains" battle that screws over people with illiquid shares.