Sorry, I wasn’t clear. It has more to do with, how does an artist know what you’ve licensed and what your users have uploaded unlicensed.
Now: You pay to license photo ABC
Later: A Roon user downloads the exact same photo (ABC) from the internet (unlicensed) and uploads it to Roon. You then no longer have to license this photo because you got it for free. You terminate your licensing agreement.
This is a one photo example, but expand it to tens of thousands. I understand licensing agreements aren’t per-photo at this scale, but let’s not be foolish. If Roon can get rid of photo licensing costs, that’s a big win and less of a liability for the lifetime subscribers who no longer pay.