Ultimately it was Radix/Shadcn (which uses tailwind for styling of course) that killed the need to buy Tailwind’s UI kits by offering all these primitives with good default styling for free.
Also, the tailwind UI stuff feels pretty dated at this point in comparison to what’s offered in other free UI libraries these days.
For example, I now routinely use AI to create UI components and my prompt usually includes "use ShadCN like component here" and even give them specific shadcn component names. The result is usually 90% good enough to start with.
There's a reason companies like Adobe/Microsoft switched away from one-time purchase software, and that reason is that it is exhausting and eventually impossible to sustain a business where you have to hunt for brand new customers every single month just to keep the lights on.
You can't compare it with software licensing subscriptions.