Medical malpractice premiums are very high, insurance payouts are stingier, and medicine has become more capital intensive than ever as newer medicines and diagnostics increasingly dominate, along with an aging population that needs more intensive care.
Doctors report being more burnt out than ever. It's an attractive proposition to outsource the hard and messy stuff to a firm that knows the business angle well so that they can keep their sanity and focus on what got them interested in medicine in the first place while still getting a great salary.
I don't love the situation, but let's not pretend it happened in a vacuum.