My wife teaches at a university. The title is partly bullshit:
For most teachers it couldn't be more obvious who used ChatGPT in an assignment and who didn't.
The problem, in most instances, isn't the "figuring out" part, but the "reasonably proving" part.
And that's the most frustrating part: you know an assignment was AI-written, there are no tools to prove it and the university gives its staff virtually no guidance or assistance on the subject matter, so you're almost powerless.
It was made illegal in the EU years ago.
The rule is pretty simple: you have to be able to cancel a subscription the same way you signed up for it. If you used the Internet to sign up there better be a fucking button that allows you to cancel.