The bus factor
The "bus factor" is the minimum number of team members that have to suddenly disappear from a project before the project stalls due to lack of knowledgeable or competent personnel. en.wikipedia.org
The bus factor of an indie hacker¶
For an indie hacker, or any solo entrepreneur, the bus factor is often just you. You're the one with the passwords, the credit cards and the knowledge of just how all the pieces fit together. If you're not there, no one can replace you.
The bus factor is very high among solo founders, solopreneurs and indie hackers because they are often the only person working on the product and when they're unable to continue working due to any number of reasons the product is immediately dead. Investors rarely invest in the startups of solo founders due to this. needgap.com