It is not a form of mind control. Listening to a hypnosis session is similar to watching a yoga or tai chi workout video. You are given instructions that you can choose to follow. With practice you can get better at following the instructions. If you resist or do not try then it will not work. Listening is not enough. You also need to take action.
Listening to the same mp3 once a day for 2 weeks can give you a completely different experience than your first time. The audio is the same but you change like you would if you were doing an exercise routine every day. The first time I listened to a meditation session it did not seem to work. The 10th time I entered a very deep state of relaxation. It worked better than I thought it could.