Yes you can say that they need to spend $135 to buy a TV, but given that you can get a HDMI/DVI monitor for <$100 on sale, why would you spend more?
And that's assuming that they can't use the TV. It's also possible for them to use the monitor and keyboard of the family computer without using that computer (with all the things people are worried about there)
It's also easy to have a 'lab' at school that just has TVs, or TVs + Pi computers (without the SD cards) so that there is no software maintinance hassle and let the kids use that at lunch and before and after school (you do need to pay for a teacher to sit in that room during that time)
Yes, there will be kids this doesn't work with. There are kids that schoolbooks don't work with, but you can get pretty good coverage here cheaply.
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