That was my concern too. However, the provided links to both the ToS and privacy policy were the standard Google ones (https://policies.google.com/terms https:

That was my concern too. However, the provided links to both the ToS and privacy policy were the standard Google ones (https://policies.google.com/terms https://policies.google.com/terms), so it seems not to be giving Opal special privileges to read/train on Drive data.