I am not that knowledgeable with tax advice, but from my understanding you should be able to deduct this fee because when you sell stock or crypto, they allow you to subtract the amount from the total gain. In this case, they are selling the shares and the proceeds go to grayscale to account for their "fee" so we as taxpayers should NOT be counting this as gains as the money is not coming to us. That seems like common sense (not tax advice) so I am checking that box that says sales was not included, and I am putting in the exact amount they sold for their fee. Maybe I should put the difference between that amount and the cost basis, but at the end of the day, I want to completely eradicate the fee as any sort of cap gains that I took. I feel okay about this as the full amount is listed as my expenses/fees at the very top of the brokerage consolidated form.
