For some reason, I was thinking of Yotta bank. They gamified the experience because it doesn't really give you that much interest. In a way, they want people to come back daily to try out the lottery. If you win the lottery, which is kind of likely, I think the interest rate evens out to be around the same as an online bank. I never used it but I do remember seeing some ads for it.
RE: Virtual Bank Apps In Nigeria: An Experience Of Gamification