Lesley Carhart 
Ad blockers are also cybersecurity. Say it with me.
They reduce malvertising, watering hole attacks, and general malicious script execution. It’s not all about you, ad firms.
John Philip Bell@hacks4pancakes
It should be pointed out that if YouTube wants to deliver ad content it can do so in-line with the video stream. Surly they can afford to pay the bandwidth and take responsibility for the content being delivered.
What ad blockers and DNS filtering is really about is stopping websites from connecting your computer/browser to a third-party URL/server, which is done without your explicit consent.
The fact the world is 'okay' with that construct in web design is not only a privacy and security issue with respect to this normalized way to deliver ad content it is also an issue with web practice in general (pulling Java-script, etc. from third-party repos) which gives the appearance of abdicating websites from supply chain responsibilities with regards to delivery of malware.