Perhaps a better question is why do you teach? Although we can’t be sure of the accuracy of the answer; there are some obvious forces in play.
As Nicholas Taleb points out, if you are teaching how to retire wealthy then it’s clear it’s a hustle since you are not retired.
If you are teaching because it’s what you need to learn, that’s an excellent way to learn, and provided we are honest, a reasonable way to make a living.
And if you are teaching because you are an expert, if your environment is designed around “should” not “could,” that’s more about utopia than it is about learning.