The existence of billionaires is obscene in itself.
But Taylor has made that money herself, from her songwriting, because people love what she has to offer.
Other mega-wealthy people, few of whom make their fortune from hard work, find ways to avoid tax that involve offshore accounts and funnelleling away of money where no one can touch it. So if Taylor chooses to write off tax while also feeding several cities' worth of hungry people then isn't that just a little bit better?
Her tickets aren't massively expensive if you manage to buy them in the first instance - where it's Ticketmaster bumping up the cost through its own fees and profiting hugely from the demand for Swift tickets - the costs become astronomical in the secondary market where it's touts and resellers profiting from wildly inflated prices.
The Eras show is boosting the economy everywhere she takes it. She's doing more than a lot of governments - certainly ours! - to directly benefit people.
And she's making incredible, vast, dizzying amounts of money - sure. And I'm horrified by anyone holding so much wealth. But as far as billionaires go, I think she's doing more good than most. And people love her, and love her music and I love to see art generating so much wealth and so much joy when the arts are diminished and reviled all the time.
TLDR: she's better than all the murky hedge fund billionaires squirreling away their fortunes from tax and charity and doing nothing to improve anyone's lives.