This is an outbound application firewall for MacOS that allows you to block applications from phoning home. It blocks outgoing traffic rather than incoming traffic, which can be toggled within the firewall settings. It has a time-limited trial period, but I did the one-time-purchase for 9 $ and it served me well since I bought it in - I think it was in 2021 - originally to keep a not-so-legally-obtained Photoshop Suite from connecting to their servers. The app is not intrusive, no annoying pop ups or the like. The app launches automatically at system start up. Occaional updates (bug fixes or to match with the latest OS version) are included with the licence.
Today I use it to block a pirated version of SketchUp (the only remaining software I have installed that has been pirated) from calling home, als well as Affinity 2 (and, probably in the future) the now free Affinity 3 (since it was aquired by Canva).
I consider this app worth its money.
I did once. It was back in the days when all of my software was pirated - even Little Snitch (where you had to add Little Snitch itself to its blocking rules, to prevent it from phoning home). As far as I can remember, it was too expensive to buy - at least for a permanently broke student at that time. Later I discovered Radio Silence. I wrote that I had RS from 2021 onward, but I think I already had it in 2018. Not 100% sure.