Fear of sunk cost is why I only built developer tools so far. As a developer, I know what tool I need to build software quickly and effectively. But unfortunately just as I finished building my no-code/low-code platform, the dev tool market has become completely monopolized. All developers are focused on a tiny number of tools so now I'm forced to focus on a niche outside industry. Thankfully I can use my own no/low-code platform to build such apps very quickly so that's what I'll do.