Yep, that bring-your-own-tv is the model the Apple II, the Commodore 64, and the Atari 800 all used -- good to see that reuse is still alive.
You assume everyone has a television.
If you don't need top level performance, and for a cheap PC why would you, you can get a 1080p desktop sized TV (22 inches) for $80.
Old monitors can be found in thrift stores and the facebook market for $5-10 too.
Yep - I recently just gave away two 2007-era monitors that still worked fine, for free. It wasn't worth the time to try to sell them for $5...
I've been in some really, really poor parts of the world, and nearly everyone's home I ever visited, they had a tv set. What they didn't have was round-the-clock electricity (sometimes it was scheduled, sometimes it was just off and on at random) or running water.
Statistically, they're more likely to have a television than a computer.