I expect this will be flagged momentarily because boobies, but in the meantime: what's the business model here? "Truly free" is great but somebody has to pay for the computing resources.
Also, requiring sign in with Google only seems unwise, given that Google itself prohibits NSFW content.
Currently requires a login, did that change since you posted it? Credit limits too.
I was attempting to generate an image of an OSHA violation and got an error.