WRT to the article - YouTube may have clamped down on blockchain ads and extremist content, but what happens when DTube (or whoever) starting getting in to hot-water relating to the content, or the ads they're showing. Or someone decides to go hard about cryptocurrencies and taxes and they get caught up. Then it's just another YouTube without as many users.
All that said, I applaud anyone that tries to compete against a monopoly. Just think the odds are very much against them.