However, some roles lend themselves more easily to find meaning in them, think e.g. roles with patient contact in health care. Or the gaming/entertainment industry.

As a consequence, the competition on the labor side is much fiercer, and as a consequence of that, pay is lower and the chance for exploitation is higher.

So the GP basically has stated the contraposition of this effect: you get paid more if you do (what most perceive as) less meaningful work.