Another view of it is that’s just a creative use of the medium. An interactive button doesn’t serve any purpose in the screenshot, so why not find a better use for that space.
replyWhen I’m in Safari, taking a screenshot can turn into a totally separate operation (full page scrolling screenshot) and that’s a good feature.
Others complain about Google Maps showing a popup telling the user about location sharing upon screenshot - I think that makes a lot of sense, considering it doesn’t show up in the screenshot and dismisses easily.
I’m very harsh on user hostile choices, in fact I spend a lot of time ranting and raving about it, but I just don’t see that here.
The ability to show exactly what you had on your screen is one of the biggest uses of screenshots. The ability for apps to do this kind of thing breaks that use.
replyOffering something better can be valuable (sometimes) but don't alter the screenshot itself.