[candiodari]

Unfortunately personal accounts have a usable quota, service accounts have to go through all the approvals (at least 4: getting allocated at all, which cost center, what resource allocation, what scheduling priority, and this is assuming you need zero "special permissions")

Doing the same with service accounts as you can do with a personal account takes weeks before you can even get started, and informs the whole management chain what you're doing, which means it informs essentially every manager that could complain about it of exactly the right time to complain to be maximally obstructionist about it.

Or to put it perhaps less ...: using service accounts requires the processes in the company to be well thought out, well-resourced with people who understand the system (which this issue shows: they don't even have those at Google itself), well-planned, and generally cooperative. Often, there will be a problem somewhere.