I'm not sure people get desensitized. Personally, whenever I notice a really unintrusive donation banner, I have more chance to actually give money to this entity, because I've been shown so much crap all over, so I can respect someone who places a gentle nudge at the bottom of a screen I'll look at for a whole 5 seconds. I'm not sure how it degrades the experience, too.
Also, you might want to read the article. LibreOffice specifically points out the banner was moved, and not added or removed.
Also, you might want to read the article. LibreOffice specifically points out the banner was moved, and not added or removed.