They don’t, but they have to deal with being bugged by it constantly. I perceive it as if you are “infesting” a core tool, as it were. Subscribing to the pro version means creating a user, creating a user with personally identifiable information, so generally being much more involved, even when you want to just use a clean operating system.
That’s a slippery slope, anyway, if we were to take into consideration the FOSS chain, linux kernel and, of course, Debian. Yes, I expect companies to be able to use Ubuntu without paying. You might think it’s an “ugly” truth, but it is what it is. And I think that’s actually very important, too, the fact that people simply use it. And they can contribute in turn with as little as pointing out bugs or even with merge requests. If they need support, they’ll pay for it. If they need fast security updates, they’ll pay for it. Otherwise, the operating system should be clean. Ubuntu has a purely community-driven operating system at its core. But all this is probably an officially unpopular idea, I know.
Anyway, to my mind, the more you push users and limit their choice, the more they’ll start looking for other solutions.