I didn't know it was well known but that's exactly how I felt when I recently tried to use it. My local bar bought an integrated 2 deck Pioneer DJ player, but turns out it doesn't store analyzed BPMs or waveforms and to get that you need to use RekordBox to analyze your tracks and export that to your USBs. When I tried to install the software it requires signing up for an account and a subscription and what not. I still couldn't get it to work and abandoned it. I won't be going back to it the experience isnt worth it. I'm instead having more fun just beatmatching by ear with the pitch fader :)
Yeah I just didn't have the license at hand at the time. I usually just practice with Mixxx at home and then just use my vanilla USBs with whatever equipment is at the venue. I can play with vinyls so pretty much any equipment works for me. I do like all the QoL features of modern gear though.
Must have gone under my radar, there probably was some license included with the device my local bar bought too but I didn't have it on hand at the time.