When someone visits their friend's shareable link why doesn't that trigger a referral?

When someone visits their friend's unique share link, a successful referral will not be triggered, because merely visiting a webpage will count as an impression, which is not the same as a referral. A successful referral is triggered when the website visitor takes a specific action. See more details here.

For example, if a participant shares their unique link (e.g, https://yourwebsite.com?grsf=d218xJ) with their friend, if that friend visits that URL, this counts as one impression for the participant and a successful referral is not triggered.