There is some truth in that, but if you only spend 1 month on a project it will be really difficult to realize any potential there might be.

It shouldn't be about the time spend but how quickly you can validate assumptions, those are different things.

My point is: It's not "that easy". I'm pro indie hacking, but it's hard work and difficult to create a profitable business that you can live off. Spinning off crappy quick projects only works if you have a big audience you can sell to, and most don't have that, so they will have to put in a lot more effort and time.