Unfortunately, there is a narrative that when a player decides to transfer it's all because they want more NIL money. The NIL & transfer portal have changed the rights for NCAA players.
Most D-1 players where the stars of the playing field through high school. When they arrive at a D-1 school they may longer be the best super star on the field, therefore they do not get playing time. Especially if they are on a team with a talented roster. Some come to the realization that they might have to switch to a school with lesser competition. Or even drop down a level to get playing time.
If that change brings them more playing time and pays them more then they are extremely fortunate. In most cases we don't know what they were making prior to the switch, nor do we truly know what they will make at their new home.
If a player believes in their heart that they can make it to the next level if they can get exposer playing at a different school, I can't fault them for living the dream. I don't like losing players, but I can't fault a player for banking on themselves because in the end it will become a business.
Good luck to all the transfers. Thank you for giving your all to Tennessee. Hate the game not the player.