The author in another comment posted this which very clearly indicated they are bootstrapping a low cash side project from their own wallet:
> If this were a business and someone else's money I'd do the same. This is a bootstrapped side project coming out of my own wallet. If money wasn't an issue, I'd probably just allow people to download images for free.
We usually spend about $60/month at Google anyways, so $100 wasn’t a crazy jump. That could be one left on Cloud Run instance. When it jumped to $300 total after disabling it that’s when I got worried.
> If this were a business and someone else's money I'd do the same. This is a bootstrapped side project coming out of my own wallet. If money wasn't an issue, I'd probably just allow people to download images for free.