People would have to agree they were monopolies first to even argue about that.
Please explain to me how YouTube is the sole supplier of a good or service and how they use high barriers of entry to prevent potential competitors from joining? How
do Vimeo, Dailymotion, TikTok, Twitch, Rumble, etc continue to exist?
It's a monopoly to the users, when a source of crucial information (say, a politicians' declaration) is only made available on Youtube.
It may not be to the market, because the politicians could have hosted that declaration video elsewhere but that's not the users' concern. They could ask owners to post their videos elsewhere, but that's not the users' choice.
Please explain to me how YouTube is the sole supplier of a good or service and how they use high barriers of entry to prevent potential competitors from joining? How do Vimeo, Dailymotion, TikTok, Twitch, Rumble, etc continue to exist?