Just to post in blogs, github pages, etc. I'm biased but I think you would get free marketing if people embed it, and a paid feature for people to keep them private (password locked, whatever).

That way people who publish free educational content (freecodeacademy, me - example, a todo app tutorial: http://gun.js.org/think.html , etc.) would spread scrimba awareness. The inverse, sites that charge for classes - Udemy, etc., have a natural incentive to keep their content secret, which they'd have to pay for.