They benefit from people blocking ads, just not their ads. And they can't just build something into their browser to block everyone else's ads by default because that'll be uncompetitive.
Is it? I've seen ad blockers try that "privileged ads" model. It's hilariously unpopular and unprofitable due to product market mismatch.
Maybe I am cynical about the law, but I assume the only reason they don't block other networks is because it would be their same advertisers, and they would be furious enough to take action.
Note however that they get to decide this criteria, I as a user does not have any input as to which ads are "disruptive". And hey, it just so happens that their criteria allows for their own ads.
Yes, which is not "block everyone else's ads". Your own first link says that websites eventually fixed their ads to comply with their "Better Ads Standards" and thus became able to show them again.