This feels a bit like motivated reasoning to me. This little tool of yours could instead be a seed you build around. Do you have access to a market? Yes? You are in a better position than ten thousand other vibe coders with a similar idea. No? If you have the stamina to pursue a market, you have more stamina than thousands of vibe coders who will just give up.

Another way to say the same thing is that many (not all, of course) SAAS were already service with a software, especially when starting out.