Does Wacom have any competitors? Can you even vote with your wallet, or is this yet another market that isn’t really a market at all?
They technically have competitors. For example Monoprice makes some gear that various bloggers consider to match or, in some cases, exceed Wacom’s equivalent offerings (and at lower cost) …aside from Wacom holding a patent on styluses powered inductively rather than by batteries.
There are even Linux drivers available for at least the ones I looked into via the DIGImend project.
The problem is that Windows or macOS users may still have to install the Wacom drivers in addition to the ones for the competing hardware because Wacom is synonymous with “drawing tablet” in the minds of people that some closed-source drawing programs only enable their tablet functionality when they detect installed Wacom drivers.
In a world of iPads and MS Surface, Wacom is in legacy mode.