Is Dimagi making any moves to comply with the EU's GDPR? It may be that you store no personal data on EU citizens but if you do then GDPR rules will apply to you.
There's a useful article here:
The reason I ask is that we, as an organisation operating within the EU, are having to comply by the end of May, and if we used CommCare within Europe (which we don't) they we'd be seeking reassurance on GDPR compliance from Dimagi.
Regards
Simon