Ask HN: Startups Failed due to Operational Challenges

Which are the startups that failed due to Operational Challenges(and not essentially due to Technology).

By 'Operational', i am referring to issues like Vendor management, wherein things are outside the control of a 'process'.

Also, i would like to know about cases from developing world, wherein subscription fees are collected manually and not online, and the users do not end up paying or delay the payment(this happens a lot in India).