Yeah, like, I think this is a bad move for Duolingo as a company, since their code quality will rapidly go downhill with the current state of AI generated code.

But also, if you are a contract employee, you should be prepared to be let go at any moment. That’s sort of the whole point of being a contract employee - you are only employed for the contract. It isn’t unethical in anyway for a company to not rehire employees who knew up front that they might not be rehired.