AMD won't be making the same exclusivity mistake again with the mobile Ryzen 5000 series. The chipmaker has confirmed that all of its mobile Zen 3 CPUs will be available for all major OEMs to deploy in contrast to the more limited approach with certain mobile Zen 2 processors the year before.
https://www.notebookcheck.net/Thankfully-the-AMD-Ryzen-7-5800H-5800HS-and-the-mobile-Ryzen-9-5000-CPUs-will-not-be-exclusive-to-any-OEMs.515360.0.html
Great news for whoever wants to build a custom SFF PC!