Same way you did with svb. A stable coin is basically a bank. They take in assets and generate tokens against them. If there is a mass withdrawal they would need to sell assets possibly at a loss to cover it. If they a duration mismatch then they eat the losses come withdrawal time. Go too fast and they depeg and boom

1. Do they post daily proof of reserves?

2. Are their bank accounts locked down to strictly the blockchain activity?

Proof of reserves means everyone was safe yesterday, at best.