Job insecurity while a bunch of companies claim LLM coding agents are letting them decimate their workforces is a pretty solid reason to feel like your code is being stolen. Many, if not most tech workers have been very sheltered from the harsher economic realities most people face, and many are realizing that labor demand, rather than being special, is why. A core goal of AI products is increasing the supply of what developer labor produces, which reduces demand for that labor. So yeah— feeling robbed when your donated code is used to train models is pretty rational.