[ggm]

I think, it's the "can't keep all alive by using one sub product" part. If I use e.g. email, my drive should be fine. From this, it's not even clear if adding and removing content to drive via email would maintain drive for "activity"

[omoikane]

My reading of https://support.google.com/accounts/answer/12418290 is that any activity on the account that required login counts as activity, independent of which sub-product is being used. Although it would help if they could clarify.