This video is a commentary on the subject these people reacting to.
This video is also heavily edited and revised to meet Youtube guidelines and adhere to critical review on the topic at hand. Therefore, this video is not "reused content".
All reactions used were used specifically picked to match the commentary/narrative storyline presented in the video.
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Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use."

Condolences to these reactors:

twitch.tv/NairoMK
twitch.tv/WestBallz
twitch.tv/HugS86
twitch.tv/mang0
twitch.tv/leffen
twtich.tv/hungrybox

This is sad :( Melee, Marvel, Guilty Gear, and saddest of all, Pokken D: