They are testing things. There was an undismissable banner for a week or so and now it’s gone for me.

It did not get me to download the app. I just stopped clicking reddit links.

Yeah, fortunately went away. For me it would always appear after like 30s of being on the page, meaning I would have to reload all the time while reading comments. Effective way for me to break out of the mindless scrolling though. I'm almost said they unfucked it.