I really, really like your list! It's awesome to see how many ways there are to earn some extra income on the internet. Definitely going to look into some of those...
One thing you might add to a future list could be earning through ONG.social. It's a social media platform similar to steemit but it can also be used as a hub to post on other social media pages (soon steemit too ;)). I really like the concept and I figured you might like it as well since you're into steemit...
Keep the good work coming man!