> Part of this problem is also because courses have (in my experience) rarely rewarded actual knowledge or understanding

It doesn't matter. There is literally no assignment you can give students that they won't cheat on. In an intro college astronomy class, "Look at these pictures of planets, what do think is interesting about them?" or "Walk around your house and look at the different types of light bulbs, what kinds do you have?" Both of these will include 20% ChatGPT responses.