Copilot isn't actually bad for developers, it's just that you need to be careful with it and recognize its limitations.
Writing a bunch of REST endpoints for an API and need to implement all the typical http verbs, and you already have all the matching methods for reading, updating, and deleting values in a complex SQL database for each endpoint to call? Copilot can turn a ten minute chore into a ten second one. Very handy.
Writing those complex SQL methods in the first place? Yeah... Copilot will probably make a ton of mistakes and its work will need to be triple-checked. You'll save time just doing it yourself if you know how. (And if you don't, you have no business calling yourself a developer.)
Copilot is best for easy boilerplate and repetitive code. Problems arise as soon as you ask it to get "creative."