No. I created an app in one of these (a year ago). I have 5 serious competitors. Each are decent apps that have been in the game longer than mine - mine is not necessarily better, just with a slightly different angle.
It has about $3.5k MRR, is still growing and I spend maybe 5-10 hours a month on it.
I mean, I can think of a few brain-related questions with no good answers:
- What is consciousness and how does a brain become conscious?
- How and why is one specific consciousness attached to one specific brain (& body)? Why am I controlling my body and not yours?