The Oxford dictionary definition of a Minimum Viable Product (MVP) is:
An early, basic version of a product (such as a piece of technology, a computer program, etc.) which meets the minimum necessary requirements for use but can be adapted and improved in the future, esp. after customer feedback;
Here's a proposed improved definition:
An early, basic version of a product (such as a piece of technology, a computer program, etc.) which meets the minimum necessary requirements for use by its creators and customers;
I think in practice, in order for a product to qualify as truly viable often requires the people who build it to use the product at least as much as any other person. This is especially true for great software. Think about the best software products you use every day: your favorite mobile maps application, favorite music app, or email client. It would be almost impossible to imagine that the people who build the products are not active users of the same apps!
Now think about a bad software product that you might encounter briefly or you are forced to use: a poorly designed electronic kiosk with 1000ms lag on every interaction, or a hospital electronic system. I think there's a high chance that the people building them rarely use them, or not at all.