Referrals are simply a 'chance' to earn profit without investing anything other than time convincing people to click or register to something OR getting discount on that platform you are currently playing at; depends on your motive. On the other hand, some people will join because of various reasons; they know you so they just followed your request or they are also interested with what you are offering to them (for example:split on the referral), so I see no problem at all with these referrals.