Hi there,
I wanted to let you know that even in the free version, you have the ability to display random posts. You can access this feature by navigating to Block Settings > Query Builder > Order by > Random Posts. I’ve attached an image for your reference.
This functionality will work just as well for you. Hope this helps!
You indeed are right and your plugin is more serious than I thought it is.
It has bunch of other useful options.
I was wrong and I updated my rating.