There is invidious which is an alternative front end for YouTube. It doesn't use the YouTube API or require a Google account. You can host your own instance or use one of the public ones[0]. It seems like the download button is broken but I was able to right click save a video.
If it can offer anything near the speeds advertised without the BS of incumbents, I could see a massive amount of demand.
I figure 5% of consumers « served » by both cable and xDSL can’t get good service, and then they have virtually every rural customer that’s anything more than a low-data user. And I’d expect them to capture that one day with a « light » plan. It’s a massive market.
When you said undercut their competitors I assumed you meant undercutting the price consumers pay so I told you the price they are currently offering. I do not know that their costs are and since SpaceX is a private company I don't think we know how much it is costing them to provide it.