Why is zoho purposefully blocking Apple reminders (CalDav). This is just strange... I just can't see a reason why this is done both within the Zoho calendar and mail calendar? These are both paid services. Why?

This little simple feature is forcing me to leave Zoho. Our workflow depends on Reminders and after talking with an Apple engineer, they noticed theat Zoho is purposefully blocking this caldav port call. I just don't understand why.

Thanks!