Non-app and non-website startups
In the last few days I was thinking more and more about projects/side-projects/startups that don't require app or website, something that is not tightly coupled to visual presentation or is loosely coupled.
For example bitcoin, email, text messaging... Another example, someone pitched idea about email paywall, basically it doesn't require app or website, it's uses already existing service and just plugs into it.
What do you think about those kind of projects/startups? Have you heard of any similar?
Is it more of building a platform for people to build upon? Is that your thought process?
Not really no because in that case mostly programmers will build upon it