> Domestic currency controls seem to offer all sorts of arbitrage possibilities that can be exploited using crypto currencies, the cycle usually goes -> some weak currency -> somehow convert to crypto -> sell crypto for USD -> sell USD back for that same weak domestic currency with a markup.
That isnt evading currency controls, that is arbitraging domestic currency controls.
Evading currency controls looks like this: earn rubley-pesos, convert to crypto, convert to USD, stuff under matress.
These so called weak states and failing economies all around the world have had secondary markets (mostly in USD - see the blue dollar in argentina as just one example) since before the birth of satoshi, let alone the birth of cryptocurrency. Its not some great new trick invented by bitcoin.