It's extra misleading, because "Wayland" isn't a thing when it comes to policy like this. Unless a compositor implements some sort of user approve/deny UI when an app requests access to the clipboard, apps on Wayland can snoop on the clipboard just as easily as on X11. I haven't run GNOME or KDE in Wayland mode, so maybe they do implement something like that, but none of the wlroots-based compositors I've tried do.