Odunayo Eweniyi is the co-founder and chief operating officer of PiggyVest, a Nigerian startup that operates as a digital wealth-management platform. The 8-year-old company has over 4.5 million users, and is one of Nigeria’s biggest fintech startups. This interview has been edited for clarity and brevity. PiggyVest has operated in Nigeria for more than seven years. Are you considering expanding into other markets? When you think of expansion as a Nigerian company, you think of [moving into] Ghan...