As far as I understand it Swift got screwed over. Her catalogue was sold against her wishes to another person, so she fought back by re-recording, at a very high quality, her catalogue and effectively making her original catalogue next to worthless for the buyer.
It wasn't a cash grab, it was her sticking it to "the man" and taking control of her catalogue.
What is Taylor Swift’s dispute with her old label?
But Swift’s behind-the-scenes moves became front-page news when Big Machine sold to private-equity group Ithaca Holdings, an entity owned by powerhouse music manager Scooter Braun. He then sold her masters to another company, Shamrock Holdings, for a reported $300 million in 2019. On a business level, Braun’s move was smart: Swift’s master recordings reap profits whenever the songs are streamed or bought. On the personal front, it was contentious: Swift claims Braun, who manages stars like Kanye West and Justin Bieber, has repeatedly bullied her, and so she slammed the sale publicly and promised to rerecord those original six albums, this time with the masters under her own control. Anyone who hits play on an old version of Swift’s early songs right now will still pay into the bank of Braun.