All good things must come to an end
Judging by the quality of their last album, the retirement happened quite some time ago and they have only just got round to telling us (I say that as a fan).
However, the typo in the title of this thread ‘Megadeath…’ made me repeat an experiment. Many, many years ago I couldn’t find Megadeth via search because I searched for ‘Megadeath’, which didn’t work. Roon was then famously intolerant of typos in band name searches. Now however, something has changed. ‘Megadeath’, Pink Floid’, ‘Raydiohead’ and even ‘Baythoven’ seem to work to find the artist in the dropdown search. ‘Baythoven’ doesn’t quite work though but does find the spelling in track listings. I suppose the challenge is to find the most corrupt version of a band name that actually works. 
That would be a new thread though, as would 'Bands that really should have retired years ago but haven’t '.
Threat uprated. 
I agree with this other than they still put on one heck of a live show! I feel the same way with Alice Cooper, Santana and a few others. Their new music is meh but the shows are still a great experience.