Imagine enabling Maps, deploying it on your website, and then enabling Google Drive API and that key immediately providing the ability to store or read files. It didn't work like that for any other service, why should it work that way for Gemini.
Also, for APIs with quotas you have to be careful not to use multiple GCP projects for a single logical application, since those quotas are tracked per application, not per account. It is definitely not Google's intent that you should have one GCP project per service within a single logical application.
Also, for APIs with quotas you have to be careful not to use multiple GCP projects for a single logical application, since those quotas are tracked per application, not per account. It is definitely not Google's intent that you should have one GCP project per service within a single logical application.