The common question I get asked about building my SaaS: "What's to stop customers from making their own?"

Sure, if you want to put an equal amount of time into what I've built, be on the hook for maintaining the infra, probably diverge from what will end up being a stable spec, go for it. It won't be as good, it won't be as fast, you will be fighting Claude at every corner just like I did to build the right thing. But consider this: people still pay for Dockerhub even though anyone can spin up any number of open source registries. SaaS is no where near doomed, people will always pay to not have distractions from their actual core business cases.