Twitch.tv rolled out this system awhile ago but it really went into effect yesterday(3/16/19)for most people. I think this is really a game changer for ad companies looking to get out their brand on a big audience. Twitch.tv now embed the ads directly into the stream so even people who used the HLS/VLC method will see ads now. The only way to avoid an ad free experience now is to sub to certain channels that was grandfathered in with ad-free for subbing or having Twitch Turbo($8.99 subscription but still has limited exceptions). Twitch Prime no longer gives you an ad-free experience and went into effect of October 15, 2018(some still have it for a few more months)
https://www.reddit.com/r/Twitch/comments/b1xdgf/rip_ublock_origin_its_a_much_deeper_problem_than/
This is what the system they mentioned years ago.
https://blog.twitch.tv/introducing-surestream-for-a-better-video-ad-experience-on-twitch-3ca5ce3287c
https://www.reddit.com/r/Twitch/comments/b1xdgf/rip_ublock_origin_its_a_much_deeper_problem_than/
This is what the system they mentioned years ago.
https://blog.twitch.tv/introducing-surestream-for-a-better-video-ad-experience-on-twitch-3ca5ce3287c