I can think of a legitimate use case for this. If you watch some of these scammer youtube videos, one common thing they seem to do is get on a screensharing ap

I can think of a legitimate use case for this. If you watch some of these scammer youtube videos, one common thing they seem to do is get on a screensharing application, and have the user log into their bank account. From there, the scammer inspects the html, and manipulates the values to trick the victim. A bank knowing if someone else is watching your screen is a decent security measure.