1) non-bank fintech put client's money in the bank
2) they told clients that money in the bank are covered by FDIC which is technically true
3) fintech moved money out of the bank
4) bank insurance doesn't apply because the bank didn't "lose" anything
At least this seems to match the Evolve's part of the story from the article. And Evolve is a real bank so they should have all the records to prove it. If so then it's a clear fraud by fintechs, but FDIC can't do much. Otherwise Evolve is lying and in this case FDIC can take over.
I wonder what is a reliable way to know if in the end your money is covered or not. Trusting what the contract tells you is evidently not enough. Having a "real" individual account number in a real bank? Not sure either, if intermediary can move the money out of your personal account then account insurance likely won't work either.