phone-company so donation via krypto is the best way?
They can convert between currencies as they want, so none is necessarily better than any other, except maybe for your privacy as a donor.
In fact, I am quite surprised they are keeping the donated crypto currencies as such. Most projects would immediately convert it to fiat to protect themselves from crypto currencies' often very volatile prices and increased risks of theft. But in the end it is the GrapheneOS project that decides what level of financial risks they are willing to take, and it is hard to complain about something that have turned out to be very profitable for the project and by extension benefiting us all. I would have converted it all to fiat immediately though, if I were managing the funds.