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AMD captures 28.7% market share in desktops
(www.techpowerup.com)
This is a most excellent place for technology news and articles.
Zen1 was slower in gaming and most 1-2 core workloads, but it was immediately far faster in server, faster in highly-threaded tasks, was hugely cheaper to manufacture, didn't have the huge security flaws Intel chips had, and was way more power efficient.
They achieved that while still being on an inferior Global Foundries manufacturing process.
Zen1 was overall better than Coffee Lake. Just not to PC gamers, the loudest online PC hardware demographic.
Also, PC gamers are loud, but they make up a pretty small portion of the market. There was a time when Intel's server division made more revenue than all of AMD. Even now, AMD as a whole is only a little above that. That's not even considering the OEM market, which is far, far larger than PC gamers.
I got really annoyed with /r/buildapc. Everyone is a gamer and thinks they're the center of the universe. They haven't the faintest conception that someone would do a build for anything other than gaming and how that changes the choices.