Right, they are content blockers with a focus on malware (but also annoyances like cookie banners or whatever you'd like via right-click menu). Adware is a subset of what they block. "Web malware blocker" is probably the most concise while reasonably correct characterization.

"People should disable their web malware blockers to support creators" makes the insanity of the proposition as clear as it ought to be. "FBI recommends using a web malware blocker" makes the advice as obvious as it ought to be.