In case technical issues weren’t enough, the lawyers at Intel have apparently made it more difficult for some open source operating systems to use the latest Intel microcode.
https://twitter.com/stevelord/status/1031819787431804928
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=906158
https://bugs.gentoo.org/664134
PS: AMD is apparently still blocked at technical issues: