So read through the docs, decided to give the free tier a go and of course they are punishing me for being an existing customer.

"The Blaze billing plan (pay-as-you-go) for Firebase is required for Google projects with billing enabled.

To use the free tier, you must first turn off billing in your Google project."

I don't want 15 "projects". I want to add this to my existing one. Why on earth is this not possible?