FDIC [1] is a government insurance scheme on depositors' funds (up to a limit) with any FDIC-inssured bank of financial institution in case of insolvency.
SIPC [2] is the equivalent for brokerages and protects your cash holdings and securities.
Coinbase recently gave a warning [3] that crypto assets could be lost in the event of an insolvency. They also said they don't consider that remotely likely. But the point of that disclosure is that crypto is NOT an SIPC-protected asset.
The crypto mantra of "not your keys, not your coins" [4] is showing itself to be true.
I don't know what the outcome will be of anyone who has any assets in Celsius. It sounds like getting them out now may well be impossible but I haven't read this thoroughly so who knows? Maybe it's too late for Celsius account holders.
But I'd strongly advise anyone who holds crypto with any custodian to move it to your own wallet for your own protection.
[2]: https://www.sipc.org/for-investors/introduction
[3]: https://cryptoslate.com/coinbase-bankruptcy-wording-triggers...
[4]: https://medium.com/stakefish/not-your-keys-not-your-coins-fa...