Why aren't we see many video hosting companies adopt peertube or P2P?
For the same reason we don't see many video hosting companies, period: YouTube. It eats the entire space for reasons that are entirely unrelated to the pros and cons of p2p. For hypothetical competitors that means solving their biggest issue – gaining users over YouTube – can also not be done by going p2p (but it might of course still be part of their hypothetical tech stack for other reasons).
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For the same reason we don't see many video hosting companies, period: YouTube. It eats the entire space for reasons that are entirely unrelated to the pros and cons of p2p. For hypothetical competitors that means solving their biggest issue – gaining users over YouTube – can also not be done by going p2p (but it might of course still be part of their hypothetical tech stack for other reasons).
It’s strange that Youtube is so entrenched that even Russia could not muster its own alternative.
Yep, this is a stronger factor than delivery mechanism questions.