Even though there are millions of content creators and streamers on Twitch, ads are only shown on what channels?

Twitch only displays ads on Partner and Affiliate channels because these are the monetization programs that allow streamers to earn revenue from their content. By joining these programs, streamers agree to Twitch's terms, which include ad placement. This system ensures that advertisers reach engaged audiences on established channels, and streamers are compensated for their work. Channels that are not Partners or Affiliates do not have the infrastructure or agreement in place to run ads. "Partners and product-sponsored channels" is incorrect because product sponsorship is a separate agreement, not a Twitch-wide ad program. "Channels in Just Chatting and Gaming categories" and "Channels in Sports and Just Chatting" are incorrect because ad eligibility is based on the streamer's status (Partner/Affiliate), not the content category.