Past Broadcasts (VODs) and Clips are unaffected.
Making a VOD a highlight was a way around that -- Twitch would never delete those.
I'm not disagreeing that it was common knowledge that this was a way for non-partners to circumvent the regular retention policies, which is why this 100-hour limit seems like a pretty generous compromise.
Clicking through random channels just now, I didn't see a single account with any Uploads, and most of the channels who had any content in Highlights seemed to use it pretty sparingly (<100 hours). It doesn't seem like a common practice, and Twitch doesn't seem like it's trying to eradicate history, just reign in some behavior that the platform didn't intend to support.
If you're aware of certain communities who've made a practice of highlighting their entire streams (beyond 100 hours) without being partnered, maybe you could promote them here so people could help archive them?
It turns out that most people who cared enough about retaining VODs just upload them to Youtube. Youtube is simply a better viewing experience for non-live videos, and it can generate some revenue (though usually very small, unless you have a huge amount of views). One problem with Youtube is that it's more strict about (what it thinks is) copyright content -- for example, some otherwise "free"[1] videogame music is regularly claimed by on Youtube by someone who sampled the original song, so it registers as someone else's content to Youtube's content ID.
[1] By "free" I mean that original videogame music is not usually actively protected (even though it's under copyright), because publishers love when people promote their games.
This VOD is over 2 years old [https://www.twitch.tv/videos/1891768073](https://www.twitch.tv/videos/1891768073)
Automatically save broadcasts for up to 7 days (14 days for Affiliates, 60 days for Partners, Turbo and Prime users)
Maybe the video you're seeing is a highlight? Either way, I can't see it because I don't subscribe to Khaldor (I used to love watching his Starcraft 2 casts back in the day, though).[0] https://www.microsoft.com/en-us/research/blog/introducing-mu...
Not to mention the huge amount of voice samples and webcam footage you could use for more typical voice cloning, text to speech, human avatar creation, etc