Many, if not all, switched to another exchange weeks ago
UH set up a fund to lend money to affected healthcare providers
Not all claims go through the exchange some go directly to the insurance some state's
Healthcare claims are payed out over weeks and months. companies might have cash flow issues but it won't hit right away an not all at once
There are numerous levels of impact. Most customers indeed switched to alternative clearinghouses. But many of the insurance payors utilize CH to provide remittance advise and direct deposits, and it has taken many of those companies longer to pivot.
The optum/uhc funding that was made available was a joke. it was only a marginal amount of the outstanding claims. I also have no idea what their strategy is as i don't know of anyone who is switching back to CH once they are back online.
i found their lack of transparency and communication early on to be the most frustrating. Instead of working a backup plans, many companies thought they could wait it out, thinking it would be back online shortly.
I have alot more to say, and the class actions will not allow this to go away, but the OPs point is certainly 100% valid.