This article is very poorly argued. While there are some questionable things happening among some Fintech firms they're still far too small to harm the overall economy and could simply go out of business without too large an impact. Mt Gox isn't a good example because it did precisely that, and they felt the need to overplay the total loss by quoting bitcoin prices as if they were lost today rather than 3 years ago.

Seems more likely that crises from sub-prime auto loans or student loans could cause the next real issue. Attempting to compare total size of risk from massive wall street firms and banks to relatively small fintech firms seems like a fools errand.