[Fabricio20]

Does the Vision API call back to apple servers in any fashion? Like how google on-device voice recognition APIs will call back to Google when you are online (unless you explicitly pass flags to force it in offline mode).

If so, is there any risk in getting your account suspended or ip range banned somehow because of this, for example?

[mandatory]

Nope, you can use it totally offline. No way of getting banned as far as I'm aware.