Similar to Fextralife, and how they use their gaming WIKI website to feature their livestream and inflate the viewership on Twitch
This should be against the TOS imo
But in general I agree with you, the embeds can be easily abused and distort the popularity of streamers on twitch, giving some an unfair advantage. In an industry where success depends heavily on the number of eyeballs on your content and where twitch itself prioritizes larger streams it is unacceptable in my opinion. Long term it directly undermines the natural growth of developing streams, the process that has given us a rich and dynamic twitch community in the first place. The topic deserves an article if it hasn't been written about already.