Thanks, that's helpful feedback. If you have a specific use case in mind, please drop us a note through the partner program and our team can provide you with specific guidance:
https://developers.google.com/photos/partner-program/
Also, generally the wording is vague enough to cover almost anything, which means at some point, sooner or later you might have to rely on the judgement of some random future googler to prevent all your integrations being destroyed.