"Selling out" is a common expression for the compromising of a person's integrity, morality, authenticity, or principles in exchange for personal gain, such as money. ...

The term could also be used as 'sold out' depending on the context.
Glen and I discuss and break down some the most infamous turnings-of-the-tide of bands that ended up alienating their initial or "target audience", seemingly in a calculated business move in order to pursue the Almighty Dollar!!

source we used for some ideas : https://watchmojo.com/video/id/15882