We've gotten kind of use to. But here's a case of the opposite.
Snap-owned Snapchat is giving some users the ability to tag others in Stories with a link to their profile, just like you can do on Instagram.
The @ tag lets Snapchat users call each other out in Stories, the feature that lets you publish a series of photos and videos that disappear after 24 hours. You just type a username in the text field of your image or video caption.
Facebook-owned Instagram famously copied Snapchat's popular Stories feature,. It also borrowed Snapchat's face filters feature, among others.