In privacy, we talk a lot about how to protect our own data, but what about our responsibility to protect the data of others? If you care about privacy rights, you must also care for the data of the people around you. Together, we must start building a culture of data privacy where everyone cares for the data of others.
Doesn’t Apple Contacts support CardDAV natively? These sites say it does:
https://sabre.io/dav/clients/ios/
https://devguide.calconnect.org/CardDAV/Client-Implementations/
I set that stuff up but whether or not he actually uses it remains to be seen. I know he uninstalled Nextcloud Notes in favor of the iCloud one. Hes really just kind of a prick sometimes.