I've got a separate google account for pretty much each google service I use. Which isn't much, the only one of value is my android-account that manage my app-s

I've got a separate google account for pretty much each google service I use. Which isn't much, the only one of value is my android-account that manage my app-store purchases. Unfortunately, yes, it is trivial for google to link the accounts together. But I truly doubt they would do that, and they can not be certain that just because they are used on the same device that they have the same owner. But the trick is to not store anything sensitive on any of them. If google started require a phone number linked to the accounts I'd quickly investigate the option of generating dummy (but not one-time use) numbers. And if that fails I'd just stop using those services.