The Galaxy S7 and S7 Edge were introduced in February 2016 and were available in March. Of course, more than three years after the devices were released, the end of the software support line was reached.
Even Google already offers a three-year warranty for updating Pixel series phones. The good news is that the S7 series will continue to receive security updates. The bad news is that regular updates are no longer available.
Galaxy S7 will not get an update!
Samsung releases security updates for its new phones every month, which takes three months. With old phones, time is eliminated and the update is released only when needed.
Thus, although three different refurbishment schemes have been implemented, the S7 series has passed to the final layout. This means that the Galaxy S7 will no longer receive even regular security updates, and if there is a critical vulnerability, it will depend on Samsung's decision.
Interesting detail is the fact that the Galaxy S7 Active, which was released just three months after the S7 and S7 Edge were available, regularly receives updates.