A startup product should be like a virus:

1. Infectious

The product should be easy to use & “get” so people can catch it easily.

2. Survive without the host

This is more about branding. Even someone who doesn’t use or chose not to use your product, should encounter your product frequently enough to keep it alive in the back of their minds.

3. Have R0 > 1

Every person who uses your product should be in a place where they can’t but help getting someone else along to use your product. This can be natural, incentivised or nudged but is a must for growth . Your product like a virus should use the host to replicate.