It used to be that you offer subscriptions only if there are ongoing costs, and a one-time payment if not (utilities, local, etc). SaaS kinda ruined that.
I'd welcome a boom in DIY vibe-coded utilities for personal use.
But I'm not going to start adding features to my bespoke utility to fix someone else's problem.
Sometimes you just want an app does X and Y, but not A, B and Z.
I also don't think any particular idea is off limits for making a profit, if you do something and you do it well, you can charge a fee. But if the free hobby version is better then you best find a way to justify the price.
The most recent example is I wanted a simple home security system with presence detection and a private control panel, none of the free ones hit my requirements, or require custom hardware, or lock you into a cloud, or assume you can spin-up some containers - or are super enterprise grade stuff.
Within about 2 days I had an android app for my tablet, Google FMDN integration, fingerprinting of my other devices, all controllable via Telegram from any of my phones with alerts that "just work" wherever I am and include an inline gif snapshot.
What I wanted didn't really exist as any individual product, so I absolutely see the appeal of DIY vibe-coded stuff, and a day of the build time was optimizing the OpenGL motion-detection pipeline with shaders & DMA which in itself was good to learn about.
No way. Maybe most Linux users. MacOS, iOS, Android, and probably Windows users are all app-first.