At the end of a Sprint, the new Increment must be "Done," which means it must be in useable condition and meet the Scrum Team’s definition of "Done".
This Increment is useable, so a Product Owner may choose to immediately release it.
The MVP has just those features considered sufficient for it to be of value to customers, and allow for it to be shipped or sold to early adopters. Customer feedback will inform future development of the product.