Your industry doesn't itself create value it maximizes the value of other industries by connecting customers and creators. The ultimate equilibrium might see your industry having to do more with less.

Ultimately the world did everything it does now without internet marketing and ultimately could do so again.

A sizable share of a smaller pie is better than all of nothing. Essentially your concern is both correct and irrelevant.

Nobody cares if Google has to make less money to have a less crappy internet the same way nobody cares if the newspaper industry makes less money.