Why should they do that? Just because Russia has an option to use bitcoin after the swift blockage, they're going to ban it as well? How about Ukraine? They're also using it for the donations that they've been gathering to fund their arms.

I think the allies would just focus on fiat transfers and even they're aware of the option to use bitcoin and other cryptocurrencies for their wealth transfer and funding, they can't still stop Russia even if they do that.