A few months ago I noted that while UnitedHealthcare and some other carriers may be losing money hand over fist on the ACA exchanges, at least some of them are making a profit, breaking even or at least cutting their losses down to a reasonable level.
As a simple reminder, competitive markets should see some companies make money and some companies that offer more expensive and less attractive products lose money. I would be extremely worried if everyone was making money after three years, just like I would be extremely worried that everyone was losing money after three years of increasingly better data.