As a former contractor for moderation I will say that Amazon/Twitch prefer to hire full time staff. Use on independent contractors has diminished greatly over the last two years.
Also the three things you want to do can already be done by anyone in the community:
- Checks Viewer for compliance with the rules on the channels: https://help.twitch.tv/customer/portal/articles/725568-how-to-file-a-report
- Looking for bugs - https://help.twitch.tv/customer/portal/emails/new
- See 1 and 2