"Video unavailable. The uploader has not made this video available in your country". Why does this keep happening?

For some reason this seems to happen a lot. Why would the video uploader fail to make it available in all countries? Doesn't he or she want as many people as possible to see it?

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I'm talking about 'YouTube' videos, not VCR or DVD.
"Video unavailable. The uploader has not made this video available in your country". Why does this keep happening?
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