Watch ads for steam wallet codes?

Some dude in a game had a nice inventory and some kid was begging him for skins, this always happens and the guy tells him to get a job but this dude told him he watches ads and gets about $10 - $25 from it every week, so that caught my eye. I can't really spend my money on steam games and what not since i'm just a student, so basically, does anyone know of any sites or apps or whatever to recommend?

I'm sorry if this is against the rules, I checked them and there wasn't anything regarding such post, if it is, please direct me to a more suitable place to ask.