(Disclaimer: I'm part of the crew building https://ente.io ) I hope someone at Google takes a look at this and uses their internal tool to help OP. That said, this oft repeated story is one of the most compelling reasons why I think Google alternatives (like the one we're building) will catch on in the mainstream population. Not privacy. But the fact that we offer human support, whilst Google doesn't.
As much as I appreciate people like you doing new things, the same will happen to your project if it grows. There will be a point that your service will simply have too many users to handle all of their requests in a satisfactory way. If you disagree I'm interested why you think y'all can make it differently.
If it is economically viable at small scale why wouldn't it be more so at a larger scale?
Google thinks their algorithms for suspicious activity is more important than their users data. Just removing access altogether.