They did, but they still seem to be clearly leading among commercial linux distros, and the software they push keeps getting adopted while Canonical's does not. To me this reads as strategic maneuvering by Red Hat within the Linux ecosystem, and they're doing great at it, from what I can tell.

I write that as someone who finds them to have astonishingly poor taste and wishes they would knock it off, so I'm no Red Hat fan—but they do seem to be succeeding at some kind of broader own-the-core-software-of-Linux-outside-the-kernel-without-technically-owning-it strategy, by steering Gnome and systemd and having significant control over a complete (and, conveniently, architected such that it causes a ton of work for everyone who doesn't just adopt Gnome) replacement of heart of the GUI stack. Not that Canonical's much better (OMG, Snaps, WTF are they thinking)