Deploying and maintaining something in a production-ready environment is a huge amount of work. It's not surprising that most people give up once they have a tech demo, especially if they're not interested in spending a ton of time maintaining these projects. Last year Karpathy posted about a similar experience, where he quickly vibe coded some tools only to realize that deploying it would take far more effort than he originally anticipated.

I think it's also rewarding to just be able to build something for yourself, and one benefit of scratching your own itch is that you don't have to go through the full effort of making something "production ready". You can just build something that's tailed specifically to the problem you're trying to solve without worrying about edge cases.

Which is to say, you're absolutely right :).