Via email I've pointed the CapRover author at the osi-discuss mailing list, where they can ask questions and clarify their own understanding of things:
Oh that's funny. The repo owner immediately locked the thread after posting incorrect bullshit about what "Open Source" means.
They have their own definition of it apparently, and it just so happens to mean what is convenient to their purposes. Amazing co-incidence! (yes, that's sarcasm)
https://github.com/caprover/caprover/issues/2036