Simply, users' devices (computers or mobile phones) mine revenue for content and media producers while users get the best content without directly spending a dime. No battery drains, no security issues, and no intrusive ads, means a win-win situation for all.
Un-balanced market growth with not enough funds to feed the content ecosystem.
Ad block use has risen to 600 million users resulting in a revenue drop of 45%.
Big ad-tech fish like Google, Yahoo, Propeller ads keep the lion's share of ad revenue to themselves.