The only way to do this is that we and the video creators should make videos on bitcointalk (or any other idea/topic) and post on other platforms. When people will watch those good videos on other platforms, those platforms will grow automatically.
With the current approach that if the platform is close to the popularity of youtube then we will go there, we can never be able to find alternatives to Youtube. Specially I am more interested to have a decentralized video sharing platform so that there will be no central control and no censorship.
Youtube has a very significant role in any case, but maybe a bit allergic to a link, especially bitcointalk.org
And promote this forum well, it's very important,
actually most of them are youtubers and others, linking bitcointalk links because for personal interests, and making public opinion to generate income instantly and easily, which of course is not good