Don't make it possible to copy spoiler text by selecting it without revealing

When I have for example the spoiler text "hello" and didn't reveal it yet, I can hover over it/select it, copy using CTRL+C and then paste it and I have the text. I didn't even need to reveal it. I think this should be made impossible because it ruins a bot idea I have and doesn't make much sense either. Also, isn't there some kind of optimization possible then because then no longer both the black rectangle and the text would be rendered?