Morality of Open Sourcing SaaS products?

One of my favorite things to do with Claude and AI tools in general is creating local, open source versions of SaaS products that charge a subscription. It’s a well deserved middle finger to certain companies and also saves money overall. I try not to do this with independently created applications/tools (or at least I don’t publish them), but I’m just curious what people think about the morality of copying somebody else’s idea and essentially devaluing their business simply because you can.

Any opinions welcome.