We've been supporting iCloud CardDAV contacting syncing for over 8 years. Never once had a problem before, but past week or so we've had numerous reports from users where they're seeing "Rate Limit Exceeded" errors coming from iCloud.
What are these limits? How can developers request for an increase (where users genuinely import hundreds of new contacts daily)? Google contacts, for instance, allows developers to apply for an increase. There seems to be nothing in relation to this in the documentation. We have no clue what these limits even are.