At first I thought this might be a Nano SaaS, but without a clear definition, I’m now guessing that would be something like one tenth of the numbers you mentioned. So “micro” seems right.

If the term or threshold does not exist, let’s define it as such.

I can not imagine spending so much time for so little return though. How many hours do you think you put into this altogether (not just including coding?)

It looks to me like if you were to do the math, you'd find that you were probably working for wages so low they'd be illegal.