Yes, exactly. It's not that adding money to your hobby per se makes you not enjoy it. It's that when you have to make money from a hobby, you lose agency over how you practice the hobby.

It turns out the freedom to practice the hobby how/when/where you want, isn't just a nice to have, but an essential part of why you enjoyed the hobby in the first place.

You might enjoy being with your wife, but if she controlled every aspect of how you were allowed to, or must, engage with her, on pain of starvation and homelessness, you probably wouldn't enjoy her anymore. You'd resent her as a slave resents his master, even if she is a relatively good master.

Agency is essential to enjoyment of literally anything.