YouTube is providing these videos through the standard html ports with no authentication necessary, like most websites on the planet. This is how you give away information away for free on the web. I don't feel entitled to free stuff, but if someone is giving it away, why not take it?

And since I'm taking what they are giving me for free, then whether or not I decide to watch the parts they try to force on me to try to entice me to buy something I have no intention of buying is none of their business.

If they didn't leave this door wide open then I would be forced to decide if it's worth enough for me to pay to use it. But since they do I do what I want. It's not up to me to make sure that YT's and creator's business models are making them money.