DMCA was hard to get people upset about. It was all new stuff that most people didn't understand or care about. This was before Napster, even.
People clearly care about net neutrality, and they would/do also care about browser ad blocking. At this point it's clear to people what the issue is and how it affects them. Taking something away from people is much more painful than preventing them from getting it in the first place.
Even if there could be enough lobbying pressure to seriously propose such a law, it would be deeply unpopular and have difficulty passing.
People clearly care about net neutrality, and they would/do also care about browser ad blocking. At this point it's clear to people what the issue is and how it affects them. Taking something away from people is much more painful than preventing them from getting it in the first place.
Even if there could be enough lobbying pressure to seriously propose such a law, it would be deeply unpopular and have difficulty passing.