http://fortune.com/2015/03/23/pinterest-employee-taxes/
Disclosure: I work for Pinterest
http://fortune.com/2015/03/23/pinterest-employee-taxes/
Disclosure: I work for Pinterest
I left the company.
Laughing at the question is obviously uncalled for, but there are legitimate cause for concern for adopting such policies.
Currently, late stage high growth companies and YC companies are the two segments best positioned to negotiate against VCs for these terms to become "standard".
That said, they are working on it and intend to implement a similar policy if possible. Reputable founders and investors don't want to force people to stay just to keep their options, nor screw people out of compensation they earned.
https://github.com/holman/extended-exercise-windows
Disclaimer: I work at Flexport which has a ten-year window.
Having ISOs matters most when the underlying shares are illiquid, and you can defer the tax obligation until a sale event (provided you don't hit AMT). When you have a 7-10 year exercise window, the company will likely have IPO'ed or have failed. The tax benefit of ISOs are greatly diminished.
I think people downplay how easy it is to hit AMT. A single, no dependents, standard deduction filer making $120k will hit AMT after $26k of on paper gain for ISO exercise. Everything after that will be taxable. Filing jointly, 2 people who each earn $120k can absorb $18k in on paper gains from exercising ISOs. Add in a kid and it drops to $15k.
That's a paltry sum, basically breaking any advantage ISOs provide.
It's a rough situation and something needs to change.