Is CHATGPT still acceptable to use ?

ChatGPT by OpenAI has been around for quite some time now, over a year at least, and marked an upheaval in the academic realm. Teachers, researchers and students from all levels have became quite used to it for a lot of them.

For homework, in which cases/what situations do you think its usage is morally acceptable ? Do the teachers that you know identify easily work done by OpenAI, or is it still easy to hide ?