https://techcrunch.com/2018/08/20/twitch-prime-ditches-ad-free-viewing-as-one-of-its-perks/

Twitch Prime, the perks program for Amazon Prime members offering free loot, games and other benefits is ditching one of its best features: ad-free viewing. According to an email sent out to Amazon Prime members today, ad-free viewing will no longer be included as a part of Twitch Prime for new members, beginning on September 14. However, members with existing annual subscriptions will be able to continue to enjoy ad-free viewing until their subscription comes up for renewal.

And those with monthly subscriptions will have access to ad-free viewing until October 15.