YouTube has restored some videos of robots fighting after wrongly removing hundreds for displaying a “deliberate infliction of animal suffering or the forcing of animals to fight”.
Sarah Pohorecky, of MIT, said film of her robot So Rachet removed on Monday “mysteriously reappeared” on Tuesday.
A YouTube spokeswoman said: “With the massive volume of videos on our site, sometimes we make the wrong call.”
YouTube would work quickly to reinstate the other videos, she told BBC News.
Jamison Go, a research assistant at MIT (Massachusetts Institute of Technology), said he had lost nine videos but others had lost hundreds.
“Today is a sad day,” he said on Monday in a Facebook post.
“Robot builders across the world cried out in agony as YouTube’s algorithm falsely identified personal videos of robot sport as ‘animal cruelty’ and ‘cock fighting’.”
Robot battles wrongly banned for ‘animal cruelty’