I fixed a 2006 macbook pro for my 3 year old to watch Peppa Pig mostly on Netflix. Used powertop and it had lot of suggestions which i just went with it. That laptop has a really good battery still. Together with CPUPOWER on conservative i avoided the processors (which i repasted) heating up and d to watch netflix with no annoying fans. Until last month that netflix stopped supporting the 32 bit last version of firefox. But for 2 years that machine was at hand in the living room, and used to Ssh into other ones, use vim and browse the Internet myself. It did take a couple of hours to set up, change the hardrive to an ssd, an upgrade to linux. But more of this needs to be done. People have so much better computers lying in garages just because they never took the photos or documents out. And after many years they land in a landfill. Linux
Is a macbook pro from 2006 with linux on it :). Good luck trying to surf the net with safari on Snow leopard Mac os 10.6 , which incidentally i had to reinstall before i could transform it into Linux! I use the browser to get me i believe rEFind by roderick w. Smith. That was an experience, i tell you. The DRM stuff is not s problem on firefox after you install the packages it needs.
Note that the parent may not be referring to 4k, but mere 1080p. You only get 720p in browsers except for Safari/macOS, Edge/Windows, or Chrome/ChromeOS.