30-min video gives 30 minutes view time to the producer (if watching the whole vid). The text format blog is made easy for those web scrappers to copy (and/or distribute automatically in split-second). It's gonna hurt the producer (wasting time, effort, plus feeding know-how for free-riders). That's why long-form vids are more preferred than pure text and graphics. Also, English videos are easier 'copied' than other languages (though it's not hard for AI)