Well it very obvious by it's name, crypto bloggers make money through blogging of course. One way to do blogging is on youtube, basically youtube will pay every bloggers depending on the numbers of viewers and followers your channel has.
It's a combination of video making and blogging on YouTube.
They call it vlogging. If you have a great reach of subscribers and viewers, you'll earn more there because of sponsorships and the monetization that YouTube is offering.
More views, more possible sponsors and profit.