I have referred several friends over the last few years. All referral fees were paid each time. The rules for qualification need to be carefully read and the referral fee was paid immediately after the rules were completed.They frustrated my attempts to gain the refer a friend reward just honouring one refer a friend unlike Revolut.
I had an account which I didn't use for a long period. I was offered free netflix for a year if I did one monthly transaction. This offer was fully honoured by N26.
My wife also had an unused N26 account and she was offered 10 euro per month for 6 months if she made 1 transaction per month. This offer was also fully honoured by N26.