Restricting an account lets you limit interactions with the user without blocking or unfollowing them. This is more helpful to limit interactions on posts, since restricted users will still be able to see your Stories.
What happens after 10k followers on Instagram?
Once you have 10k followers, Instagram will make it easier for you to get people to your website via Stories with the swipe up to link feature. Swipe up is the only way to get a direct link from your Instagram to your other web properties. And, it’s available in STORIES, if you have 10k followers.