Everyone here is well aware of ad-blocking technology, but MANY people in the world either don't know how much difference it makes, or think it would be too difficult to set up. Helping an unsavvy person set up an ad-blocker may make a substantial positive difference in their life.
You should try adding ad-blocking to your crossfit routine. My old trainer, Brandon, recommended using AdBlock Plus, but my new trainer, Duncan, got me to try uBlock Origin, Privacy Badger, and Ghostery, and my clicking finger is so pumped. I can't even pick my nose with it any more!~
Crossfit might kill you, but as a user there's no practical downside to ad blocking. Faster web? Less chance of malware? Less annoyance? Heck, a product marketed as doing all of those things could probably be sold all on its own if not for the meta-irony of an ad for an ad blocker.
Seriously though, this is a good thing. Everybody needs to know about and install one. It should be considered a part of basic internet literacy.
The downside: all content starts becoming premium or paid content. Or it disappears behind all together. Without ads, YouTube would not exist in its current form. Though something like vimeo make take over, not everyone wants to pay to host their content.