I just went to StackOverflow, where I'm logged in and don't get the GDPR box. With my browser at 100% zoom, it's over 400 pixels from the top of the page down to the top of the first question's box. Over 100 of those pixels are a banner saying "Welcome back, (username)". Their landing page is absolutely polluted with UI bloat that is far beyond just the GDPR box. The first piece of real content is literally on the bottom half of my laptop screen. Even the ~56px sticky floating header is clearly superfluous; getting back to the top of the page to access those UI elements is far too easy to justify keeping those controls on screen at all times.

They also have a Google popup.

I've managed to create an uBlock Origin element hider to hide the DIV with that particular CSS class (or ID?) across all of their sites - hiding it on just 1 site would disappoint because they use so many goddamn domains.