Sounds like iDrive spammed every contact on his iPhone, and because of the fact/coincidence that he has gmail set to save every person you ever send an email to

Sounds like iDrive spammed every contact on his iPhone, and because of the fact/coincidence that he has gmail set to save every person you ever send an email to as a contact, AND because of the way he is using gmail on his iPhone, this became "iDrive spammed my gmail address book". If a company is selling a service (iDrive) which is basically "store your contact data on our services, trust us with this data", it's pretty shitty for that company to then turn around and market to the contacts in that data. It's probably in their TOS or something, but it still feels like an abuse of trust.