She began releasing her re-recorded albums in 2021, starting with her breakthrough, coming-of-age album Fearless.
Produced with forensic attention to detail, they were often indistinguishable from the originals - albeit with slightly cleaner mixes, and greater separation between the instruments.
But the big attraction was the bonus tracks, including the unabridged, 10-minute version of her break-up ballad All Too Well - described by Variety magazine as the "holy grail" of the star's back catalogue.
The song went on to top the US charts, and made number three in the UK - where it is the longest song ever to reach the top five.
In the meantime, the singer continued to release original material, including the Grammy Award-winning albums Folklore and Midnights.
In 2023, Forbes magazine reported that Swift had become the first musician to make $1 billion (£740 million) solely from songwriting and performing.
Half of her fortune came from music royalties and touring, while the rest came from the increasing value of her music catalogue, including her re-recordings.
Revisiting the old material also inspired Swift's career-spanning Eras tour, which made more than $2 billion (£1.48 billion) in ticket sales across 2023 and 2024.
In her letter, Swift said the success of the Eras tour "is why I was able to buy back my music".
She added that she was heartened to see her struggle inspiring other artists.
"Every time a new artist tells me they negotiated to own their master recordings in their record contract because of this fight, I'm reminded of how important it was for all of this to happen.
"Thank you being curious about something that used to be thought of as too industry-centric for broad discussion.
"You'll never know how much it means to me that you cared. Every single bit of it counted, and ended us up here."