Jeez! I just saw it also in the Reddit and try to search it here.
This is kinda scary. I think this is a bug on their mobile app? Like maybe they are using it the clipboard copying part when there is some invoice or addresses that you will pay after you copied some of the addresses.
This is an example of even which OS we are using, there are still a lot of risks, especially on the video, it is using IOS.
IOS doesn't mean hack proof, they are far better than android open market but still IOS apps has malicious actions like this and will be removed when it is reported to the appropriate officials.
Still I am using android but only electrum and coinomi in my android these are enough for my usage and all the others were in desktop wallet.