If view count is the measure, this Russian skater must be the most popular of all. https://www.youtube.com/watch?v=o3c_xV78jFE&app=desktop
And Starr Andrews with her 55 million views and counting should be the world most famous skater: https://www.youtube.com/watch?v=QBxpjtcBAG8
Also, those who are using Youtube views as means to show that skaters have most popularity must keep in mind that many videos with tons of views got cancelled for copyright reason over the year. For example, if Jason Brown "Riverdance" original video or Yuzuru "Hope and Legacy" or Yuna "Bond" were still up, I think their number would be considerably higher than what the surviving videos show now.