The first is the revenue it derives from its digital readers.
The second is who NYT readers are.
The third, as @bariweiss described, derives from the changing definition younger journalists have for what journalism is supposed to be.
Dean Baquet, the Time's top editor, said in August, 2019, "What I’m saying is that our readers and some of our staff cheer us when we take on Donald Trump, but they jeer at us when we take on Joe Biden…
He's admitting Trump supporters probably don't read the paper. (The Times should release its marketing surveys of its readers...)
The business model of the Times can't succeed if the paper is neutral or fair. It must be anti-Trump. And when he's gone, anti-GOP.