But if you want to host it somewhere where there’s no option to refuse monetization altogether – where all you’re offered is a choice of how it happens-- that would require a special (and expensive) license from CoG.
It’s not so much about “competing platforms” – that language comes from a clause that applies to published games, not WiPs. It’s about Choicescript being free to use non-commercially, but not free if you’re making money off it. And that holds true if you’re publishing on your own website with a tip jar or Patreon link, not just if you’re publishing on a hosting site owned by some other company.