I was working in adtech company and heard that a lot about GDPR. Oh, we had some loses due to GDPR, it is ruining the ad industry etc. Guess what? The population didn't change there's the same number of internet users. What changed is how much information you are able to collect about users, and not just you but your competitors as well. You might need to adapt, but that happens in every industry.

Frankly laws like GDPR might actually be saving the industry, because the arms race to figure out how much information you can get about users is why users start using ad blockers.