I think P2P has stood the test of time. Torrents scale extremely well, any large scale video would have so many peers the server wouldn’t have to participate at all. These days most torrents easily saturate my gigabit connection no problem with just a handful of peers. Torrents tends to spread like wildfire.
The main issue would be storage space, but I think a lot of YouTubers would be perfectly okay with spending $5-10 a month to pay for the storage costs with all the benefits you get from not being tied to YouTube’s ToS and policies. It’s a drop in the bucket compared to the earnings from sponsor spots.
If you don’t want to be monogamous, don’t, just be polyamorous and date other polyamorous people. It’s a really bad excuse for cheating when there’s plenty of relationship arrangements where this isn’t a problem. There’s no need to deceive unwilling people and cheat on them when you can find partners who think the same as you and you don’t need to cheat on in the first place. You’re still dealing with other people with feelings on the end.
I’d have to really go out of my way to cheat on my wife when the only rule is to have safe sex (or be safe in general).