It's frequently touted as such, but don't you generally need some supply-demand parity across the borders?

E.g., there's likely high demand for USDT to move money out of Russia, given the currency control and Visa/MC restrictions. But if you're currently in Russia sitting on a massive pile of USDT, you probably don't want a massive ruble exposure either, and hodl'ing that USDT seems like a fairly solid strategy for the time-being?