Well, ain't that a kick in the teeth. Guess it's Patreon from here on out.pic.twitter.com/GbXDPPhsTY
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Really, it's often just been taken for granted that it's fair use while most being responded to either don't care or can do nothing (sometimes both). The amount of the original videos used does leave it somewhat questionable, the same way companies can sometimes remove criticism.
But I do think those clips are more likely. The response video the argument would be over if more was used than should be. The other clips aren't essential.
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