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YouTube's ‘War’ on Adblockers Shows How Google Controls the Internet
(www.404media.co)
This is a most excellent place for technology news and articles.
The reason there is no competitor is that YT was intentionally run at a loss for years to quench all other video hosting platforms and establish a monopoly.
Alternatives do exist but they are irrelevant because the vast majority of content is now being uploaded to the biggest platform. Which is precisely in accordance to YT's plan.