[BjoernKW]

I'd use it if its sync capabilities weren't iCloud-only.

From a business and development point of view I totally get why they opted for iCloud: It allows them to focus on their core business and delegate the supporting domain of data synchronisation to someone else.

Unfortunately, since for my own business I'm using Google Workspace and Google Drive that's not really an option for me.

Bear rightfully claim that they're GDPR-compliant. However, they're kind of just delegating that issue, too, since Apple, in contrast to Google, doesn't provide a GDPR-compliant data processing agreement to business customers. It's debatable if such an agreement is really necessary in this case but as with all things GDPR it's better to tread carefully.