It may be better to get those with a few hundred or thousand followers who struggle to make anything on other platforms. Moving their activity here and bringing over their fans could benefit both sides.
It's interesting, we have had a fair few people with large followings on Youtube and other platforms talk about Steem over the years. Aside from DollarVigilante and some others in the anarcho-capitalist space as well as Jerry Banfield, it doesn't seem like any of them ever really brought many followers over with them.
I agree that the alt-right and to a lesser extent the anarcho-capitalist leanings here turn off a mainstream audience. I think this can be improved with more focus put on communities (moving away from trending as the front page on Hive websites). Ideally communities should be broad interest categories, not the weird list of communities that we have at the top now (it's hard to even know what some of them are about based on their names). The top two communities now are "curation", "high quality original content" communities.. which is borderline meaningless to most people.
I think those Youtubers did bring in a lot of people, but only a hardcore bunch have stuck with us through the ups and downs.
Communities are a bit of a mess. Perhaps peakd could suggest communities to look at based on the tags you use. There could be more intelligent use of tags as a lot of them are pretty pointless.
I also don't like those 'curation' communities. Nobody is going to go looking for content to actually read/watch/listen there. There is too much emphasis on strategic voting and not enough on real engagement.