According to Quartz's article, "Taylor Swift gave six-figure bonuses to the Eras Tour workers in the US", the claim appears to be true!
Eras Tour is expected to make $1.4 billion dollars by the time the national and international leagues end, leaving Swift with a projected net worth of $780 million. The article also notes the typical gratuity an artist would offer truck drivers for driving their set and equipment would be between $5000 and $10,000. Therefore Swift's contribution is even more astounding.
The article writes, "the bonuses Swift doled out totaled about $55 million, and they included dancers, riggers, sound technicians, catering, video, audio and lighting—everyone who played a part in taking the show across the country... truck drivers got $100,000 each. Between the two companies, 50 workers got the hefty payout," (Bhattacharya 2023).
https://qz.com/taylor-swift-bonuses-eras-tour-workers-us-1850702921