As long as the conversion was done at the exchange rate at the time the grant was given, I would say it doesn’t matter.

But taking an ancient bounty and multiplying it by an exchange rate from years later would definitely be silly.

Most large crypto bounty programs are paid in things that are instantly convertible to dollars (mostly USDC, some DAI/USDT or occasionaly ETH). There are a few out there but in general the dollar numbers are real.