he can't pay income tax if he's never received the income.
"I will be left with a tax bill on $10,000s of additional "income" that I never received"
"I will be left with a tax bill on $10,000s of additional "income" that I never received"
His paper gains are taxed. It's not quite "income" but it's taxed that way.
If he's really a founding engineer though he should have filed an IRS 83B election and basically paid close to zero tax on all this