On (version 47 of) Gnome/Wayland, any program can take a screenshot (by calling out to gnome-screenshot) but the screenshot is accompanied by a flashing of the screen to alert the user that it is happening.
Gnome probably attempts to restrict taking a screenshot without flashing the screen (and I'm currently trying to figure out how to bypass the restriction).
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On (version 47 of) Gnome/Wayland, any program can take a screenshot (by calling out to gnome-screenshot) but the screenshot is accompanied by a flashing of the screen to alert the user that it is happening.
Gnome probably attempts to restrict taking a screenshot without flashing the screen (and I'm currently trying to figure out how to bypass the restriction).