Depends on what those dials actually represent (the screenshot is blurry for me). If the legal basis for the sub-processors is Legitimate Interest, then consent

Depends on what those dials actually represent (the screenshot is blurry for me). If the legal basis for the sub-processors is Legitimate Interest, then consent isn't required and the dials represent a Right to Erasure request. That would all be above-board and legit. If the legal basis is Consent, then you are correct, it must be opt-in rather than opt-out.