Anywhere from 25% to 75% of biotech IPOs in any given year are pre-revenue or unprofitable, depending on how the market is doing. That's obviously a small piece of the healthcare market in total but until the crisis, most other high growth healthcare company were moving in the same unicorn direction because of the easy access to capital.
The problem isn't the startups, its the investors who are advising and incentivizing everyone to grow out of control because they're sitting on too much money and can't find anywhere else that gives decent returns.