Fintech startups have been massively successful over the past few years. The biggest consumer startups managed to attract millions — sometimes even tens of millions — of users and have raised some of the biggest funding rounds in late-stage venture capital. That’s why they’ve also reached incredible valuations. After a few wild years of growth, fintech startups are starting to act more like traditional finance companies. And yet, this year’s economic downturn has been a challenge for the current class of fintech startups: Some have grown nicely, while others have…