Open source for the PR, then switching to non-open licensing is a cowardly, bullshit move.
https://github.com/cactus-compute/cactus/commit/b1b5650d1132...
Use open source and stick with it, or don't touch it at all, and tell any VC shitheels saying otherwise to pound sand.
If your business is so fragile or unoriginal that it can't survive being open source, then it will fail anyway. If you make it open source, embrace the ethos and build community, then your product or service will be stronger for it. If the big players clone your work, you get instant underdog credibility and notoriety.