Since when was ai forbidden from repeating the full lyrics of a song or the opening lyrics to cartoon

A user on reddit.com's dev_community inquired about AI models being forbidden from repeating full song lyrics or cartoon opening lyrics. They questioned if any AI doesn't block this, or if there's a way to gain permission, noting that they are "downfounded" that AI providers would set their own rules above copyright law, as they believe repeating lyrics doesn't break any copyright laws.