Your assets are held by a 3rd party custodian, and Vested does not touch or hold your money. If Vested shuts down, you would still have access to all your cash and securities, as Vested will ensure that direct DriveWealth access is established for you to continue to buy or sell securities.
In the highly unlikely event that both Vested and DriveWealth shut down, your SIPC insurance kicks in. Each brokerage account opened with Vested is insured by SIPC (Securities Investor Protection Corporation) up to $500,000. This includes $250,000 in cash. For more details, please read here.