According to the text,bankruptcy or forced sale is probably the biggest failure for a startup.

Forced Sale

A situation where goods are sold under the pressure of external circumstances, often at a lower price than the market value.

Bankruptcy

A legal proceeding involving a person or business that is unable to repay outstanding debts.

Startup Failure

The condition where a startup company cannot continue operations due to financial constraints, lack of market fit, management problems, or other reasons leading to its closure or insolvency.