I don't think it's possible to make much money in smartphone apps now. Prices are low, users rarely install new ones, and much competition.
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The most common selling point I hear for Nix is having a list of all the packages you need.
On a traditional Linux distro, I just install things and forget about them. A curated, commented list would certainly be handy when I have a new system.
I'm surprised by how many different weather forecasts I can get out different apps. Surely there aren't many API providers for weather predictions?
Alternative conspiracy theory: do weather apps that predict nicer weather get more downloads?
Whilst LLMs don't always give an accurate answer, the UI is really compelling. I keep finding users whose favourite way of doing research is an LLM.