This seems pretty good. As an ml engineer where I have to try various apis provided by companies, it's a big pain to manage subscription and to maintain various accounts.
I am not sure if that is the big use case for me. I liked using it to try out various APIs and then to compare what might suit my use case.
This helped us to somewhat narrow down on the image moderation API integration we were looking for in our startup.
Seems like an obvious thing to do. Not sure why do big companies like Google etc do not provide an easy way to test the APIs.
Either ways I guess Google sucks in making products for developers. Glad that this consumer products work and take off.