As I usually do orchestral stuff, I HAVE to use (commercial) plugins like musio, kontakt or sine player which many people do not own. Besides that I tend to use plugins like Waves Mastering Suite or Ozone.
Of course I could use stuff like vital or helm which are free and in that case I could upload xrns-files, too. (in fact, I did → Made something again. MP3+XRNS-File for learning purposes )
But I deleted the xrns afterwards.
The other big issue with uploading xrns might be that people use commercial samples. As far as I know it’s not a big deal releasing music with commercial samples but the companies do not want you to spread those samples. (Which is what you do in xrns-files)
And as renoise is located in germany, the “Urheberrecht” is nothing you want to fÜck with.