We recently switched to using a Linux Mint laptop with an adblocker for our streaming (while also cancelling a bunch of services). A friend at the recycling center set it aside for me - the screen was irreparably smashed but it was otherwise quite a nice little laptop. Replacement screens were too expensive so I carefully removed the broken one entirely so it'd default to the HDMI port and then set it up as a quick media center (we watch a lot of YouTube and the ads were driving me crazy, I might switch to a more purpose-built OS eventually). The TV is one I pulled from an ewaste bin to replace my previous ewaste TV after it finally gave up. It has a thin line through one edge of the screen occasionally but is otherwise fine. I also recently found a perfectly good wireless trackball mouse and a Bluetooth keyboard in the same bin where I got the TV (came with that other mouse). The bin even supplied HDMI cables. The whole thing is perched on a particle board TV stand I found like a decade ago when the college kids move out.
The power draw is a good point and definitely something to consider - one of my neighbors recently put a meter on his old one and was surprised to find it drew as much power as his air conditioner. I'm not sure how to balance the higher draw against the environmental cost of manufacturing and shipping and disposing of the TV, but I'm doing my best to contribute as little to the economy as I can, so I've settled for being careful to just turn it off whenever I'm not actively watching something. My city has options for sourcing power from green sources so what I do use hopefully encourages more investment in wind and solar in my region. (It seems pretty legit from what I've been able to find anyways.)