https://www.polygon.com/2018/8/20/17761410/twitch-prime-no-more-ad-free-viewing-turbo

Twitch Prime subscribers won’t experience ad-free viewing experiences starting next month as the platform makes changes to one of its most popular features.

Twitch announced today in a blog post that ad-free viewing experiences wouldn’t be available through Prime accounts beginning Sept. 14. New subscribers won’t be able to reap those privileges at all, but people who signed up for annual subscriptions will get a little leeway.