You could argue that most of us, in every walk of life and every profession “sell out” if by that you mean do stuff as adults that we swore we wouldn’t do as teenagers!
Making a comfortable living playing music is hard enough. If your trying to do it with total integrity and no compromise I’m not sure it’s entirely possible once past the teenage years unless you have another revenue stream.
For full disclosure I’m not a pro musician. It was obvious by the age of 19 that no one would pay good money to listen to my noodling.