I really can't be too specific as it would be very outing.
When someone subscribes to something, and you get a code from a friend to use when starting the subscription, usually you will get some money off and so will your friend.
A friend of mine wanted to sign up to something and I have a code which gives me money off and them money off if they use it. I told them this.
This is something they knew very little about but wanted to sign up so she's asked me loads of questions about it which I've answered and then I sent the code.
Friend has messaged me to say they have found when going on the website that they were getting money off anyway just for signing up so they didn't use my code.
Would this bother you?