To put it into perspective, according to this here
https://itch.io/game-development/engines/most-projects
from the projects that identify the used engines, Unity is most popular by far. So while most of those devs surly will not meet the threshold, it still may affect them indirectly. And since the pricing policy is especially hostile to the pay-what-you-want model so popular on itch, it is a looming danger in the future, as Unity might decide to change policy yet again.
Also the collection of data is problematic and might alienate players, so they try to avoid Unity-made, the same way some avoid AI assetts, drm or adware.
Oh, and if you want a popular example, Among Us costs a 5er on itch, steam and so on. But it is free on mobile and has 500 million downloads on google store. I believe the maths is not very hard on this one. Calculate with 1 cent or 20 cent. It does not matter.