I didn't realize Anthropic is a person and doing all of this for his/her/their personal use that is never shared with anyone else, and even more never for financial gain. What a fun hobby. /s

It might still be allowed for other reasons, but "personal use" isn't what they claim in court.

I am not allowed to read a book many times until I memorize it, and later record an audiobook of one of its chapters for money.

Cool, but that's also not what they're doing. They are claiming the same rights you have, the main inequality is the resources to defend it in court.