"Could governments force Apple to add non-CSAM images to the hash list?" the company asked in its interview of itself, and then responded, "No. Apple would refuse such demands and our system has been designed to prevent that from happening."
But Apple aren't creating these hash lists, its done by a third party and will be constantly updates when new images are identified by law enforcement. So it would be trivial for government agencies to create a new hash, claim its of some abuse image and get it added to the list Apple uses.