We run a couple of different Youtube channels - typically about some kind of pop culture.
We give our scriptwriters a topic and an article or two that relate to the topic and they write the script based on that.
You assign available projects to yourself in Trello and can work on your own time. As long as there is available work, you can do as many scripts per week as you want.
Scripts typically take less than 2 hours and we pay $30 per script.