Typically, a coach who is recruiting a kid who moves to another job will call the parent or recruit to advise that he is moving on. The ethical coaches do not make the first move. They wait for the parent or recruit to ask if the coach will consider accepting the kid at the new program. The ethical coach advises the kid that he was recruited to SMS and should consider honoring his LOI. Some coaches will even call the old program to advise them that they were first contacted by the parent or recruit. Playing in the SEC is different than the MVC and some recruits may not be able to make the talent leap.
The unethical coach does not give a damn and cherry picks by taking the SEC caliber recruits with him.
Conversely, the recruit can get screwed. What if he was recruited to MSU based on a certain skill set and type of play and the new guy is the exact opposite? The new coach may not want the player.
Tough situation.
First lie: "Coach, I only want to play at MSU."
Second lie: "Son, I will be here for the next 7 years."
Third lie: "Coach, I will commit to MSU if you will not recruit any other fill in the blank."
Fourth lie: "Son, you are the only PG I will recruit."