There is licensing and a compatibility mark, and I distinctly recall that my Philips BD-XL writer was badged for M-DISC and touted its capabilities.

https://www.techpowerup.com/forums/threads/new-m-disc-to-pro...

I ran Linux backups on BD-XL 100GB discs for awhile. I lacked access to space in a salt mine, and the M-DISC media was prohibitively expensive, and unnecessary, since the Linux system, its drives, and its backups have all gone away by now. And nothing of value was lost.

https://en.wikipedia.org/wiki/M-DISC#History

  As of the 2020s, there are only 2 licensed manufacturers of M-Discs: Ritek, sold under the Ritek and RiDATA brands, and Verbatim with co-branded discs, marketed as the "Verbatim M-DISC".[14][15]