In a speech at the Spring Meeting of the IMF in Washington Klaas Knot, president of the Dutch central bank (De Nederlandsche Bank (DNB)) pointed to potential (future) risks of cloud services. https://www.dnb.nl/nieuws/nieuwsoverzicht-en-archief/Speeches2019/dnb383348.jsp From there you can download the speech in .pdf format: https://www.dnb.nl/binaries/KK2_tcm46-383344.pdf (it is in English)
