Twitter will remove nonconsensual nude images within hours as long as that media is reported for having violated someone’s copyright. If the same content is reported just as nonconsensual intimate media, Twitter will not remove it within weeks, and might never remove it at all, according to a pre-print study from researchers at the University of Michigan.
If they were publicising those videos that sounds illegal to me. If I printed off a copyrighted book for my own personal use, that would be legal. If I started distributing my own reprints of a copyrighted book without permission, the copyright holder could go after me. The businesses can hold copyrighted material without distributing them and not be in breach of the law.
Many of those companies employ use third parties to store those videos and use them to train AI in products that they sell.