Due to organisational restrictions (aka a dysfunction product team) I "invented" the double "sweapsteak" referral giveaway. Which worked mostly outside of the p

Due to organisational restrictions (aka a dysfunction product team) I "invented" the double "sweapsteak" referral giveaway. Which worked mostly outside of the product (we just needed a "who referred this user"-flag), mostly just newsletters. Basically you could win 2 IphoneX. One for you and one for the person you referred. If you referred one person, this person was a ticket for you. If this ticket/person won. The referrer and the referred/ticket won an Iphone each. The more persons you referred the more "tickets" you had. If the referred person referred new people, then they gained more tickets (additional to the ticket they were themselves.) worked massively. 2 IphoneX after all. And a benefit for the person you referred and yourself. And an incentive for the referred person to refer more. repeated runs were shot down by the legal department (Fintechs which want to become a bank care about law a lot) due to gambling laws of the EU. CPAU (cost per active user) was way better than the later implemented real referral program which worked with moneytary incentives.