The tourists that visit Greece are excluded from the Greek capital controls when using their credit cards. The foreign tourists will be able to make regular cash withdrawals from ATMs with their cards, as long as they have boon issued abroad.
In Santorini, there are no problems with tourists not being able to find cash in the ATMs, credit and debit cards are being charged normally and everything and everyone is in place. Tourists have not experienced any difficulties in their transactions.