Looking at the license (MIT) we already got much more than what we paid for and the authors don't "have to" do anything but accept thanks of those who chose to be grateful for software they got for free.
The default of the command is to generate locally. They don’t need to open source an entire web app. It’s easier to deploy themselves then deal with the burden of open sourcing and maintaining.
This isn’t some conspiracy. It’s a tiny startup trying to ship something useful.
The point of my post was to say why I'm not interested in using it.