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And self-hosted can put the files in Apple's iCloud service, making it accessible on your phone. At least, that's how my own is still working.

Your weakest link is probably now iCloud, considering how easily and often it gets hacked...

Which is never, right? Has iCloud actually been “hacked” in the “Yahoo” sense of the word?

I ask because I use iCloud heavily. Nearly 1TB of photos/videos and now use 1Password with iCloud sync.

Has there been a large dump of iCloud credentials, allowing unauthorized access to accounts? Maybe, but it isn't publicly known.

Has Apple made mistakes when designing iCloud, allowing unauthorized access to accounts? Yes.

Indeed. But as the file is encrypted beyond what Apple implements, it is probably at least as safe as if it were on 1Password's own cloud.