OpenSUSE is not popular around the general user because it mainly focuses on Enterprise and It sponsored by SUSE Software Solutions.
If you purchase tuxedo computers, you will receive openSUSE preinstalled to use In some of the models you need to upfront ask for openSUSE to get Installed.
Recently OpenSUSE Leap 15.1 support has ended on 2nd Feb 2021. If you want to upgrade, you can follow the instructions from an Official site before that make sure to take a backup of your Systems
