The Scrum Guide only states that the Product Owner should accept the increment.
The Scrum Guide only states that the Product Owner should accept the increment. However, there’s a difference between an increment and the functionality that you release to production. The increment is the sum of everything that was created in the Sprint, built on top of the previous increment. A team could release multiple times a day. Everything that is done at the end of the Sprint adds to the increment that is being discussed at the review.