I honestly don't know! From the IRS memo[1] linked in your other comment, the fact that "Cryptocurrency B continued to be traded on at least one cryptocurrency

I honestly don't know! From the IRS memo[1] linked in your other comment, the fact that "Cryptocurrency B continued to be traded on at least one cryptocurrency exchange" is relevant to the conclusion that it still has a value. But unsellable NFTs are by definition not trading anywhere, right? So, ironically, the existence of a service like this might provide a price floor for all NFTs. [1]: https://www.irs.gov/pub/irs-wd/202302011.pdf https://www.irs.gov/pub/irs-wd/202302011.pdf