To be fair to adverts, without them we'd have to pay for stuff or sell our souls. OK, you get to sell your soul and get adverts, but you'll feel better in your post-partum consumer bliss. Generally, the rule holds that you get what you don't pay for.
I vote for video explanations for things that don't need video explanations though, remember back in the day when bandwidth was limited and people wrote things and saved the video for smut, which is rightful.