Terrifies me. I can't really piss 1Password off, so that'll never be a worry. My iCloud Email can at least be re-directed to Fastmail as I own the domain (other than Hide My Email, which is a shame).
It's a matter of surface area to somehow trigger the automated detection that kills an account.
With 1Password, I can only really think of payment issues (ultimately, everything within your account is just a matter of sharing a binary blob they can't read - maybe if you try to use it as a file store and the size becomes excessive), whereas with Apple, I'm not entirely certain what they could read on my machine that could trigger them (hopefully with Advanced Data Protection, this is a small surface area).
But you are right, both of them could cause headaches.
There is a difference - the surface area where you interact with that certain company. As an Apple device owner, your interaction with Apple and it's various services (known; and unknown to you - e.g. watching a certain video on YouTube in Safari) compared to that of Agile Bits (or BitWarden for that matter, which I prefer), where the service is exactly one, is much much bigger. Hence making your chance to trip so much more in case of Apple and Google.
