However, some people are concerned that this new feature may backfire by preventing legitimate use cases. For example, if a user is trying to share their screen with a friend or colleague, they may be blocked from accessing Google Messages.
Credit – TheSPAndroid
In this rollout, which appears to be limited to a small amount of users (possibly as an a/b test), what appears when attempting to share one’s screen while having the Google Messages app open is a popup stating “You’re sharing your screen with someone. If you don’t know this person, stop sharing immediately. Google has hidden your sensitive content for security.” Meanwhile, while the app continues to work in the background and notifications continue to come in, the rest of the app is blacked out and the popup cannot be dismissed as long as you are still screen sharing.
However, in its current state it does not look like the feature’s implementation has been completely tested in all possible scenarios. For example, TheSPAndroid noted in its post that when receiving a Messages notification, one could still tap on the notification and view the message, even while screen sharing. This would, of course, defeat the entire point.