So, if I get this right, she sold the performance rights up front for an estimated stream of income today.
But, she could re-record the song, re-release it, and get that back.
Sounds like a standard business deal. Did she sign off on it? Or did her staff sign off on it? At her level you do not give up “rights” without your lawyer explaining this to you. It seems should might want to direct her “outrage” elsewhere.
Taylor was not a big star when she sold some of her rights in order to get a record deal. When the record deal was very successful she wanted to renegotiate. This is very very common. Record producers lose money on most artists that they sign. When they get a hit, they promote it as much as possible and try to keep the artist selling records. But the artist’s managers or agents try to get the artist to break the deal, because they can make more money if they sign a new deal. There are hundreds of famous cases of this. Bruce Springsteen went two years without recording. The Stones put out a bad record holding back better songs for their next record deal. Then the record company put out greatest hits albums to resell the songs they own. A common trick.