In what concerns ARM and SPARC platforms, memory tagging is happening and being adopted by Apple/Google platforms, in what concerns Intel, it was yet again another from their screwups.
https://developer.apple.com/documentation/security/preparing...
Meanwhile Google is doing the homework for Android.
"[Arm DevSummit - Ecosystem Talk] Improving Your Android App to Prevent Security Vulnerabilities"
https://www.youtube.com/watch?v=zkoOD4hmiGE
And regardless of one thinks of Oracle, Solaris SPARC has had it for ages.