>Over time, this set up proved risky with legal liabilities. So last year I migrated to Stripe Connect’s direct charges model where customer payments would go directly into sellers' Stripe accounts
Sadly, he thought he could keep existing users on the old scheme:
>there were still legacy sellers that depended on Flurly for their living. Thus I "grandfathered" in these accounts and let them keep using the old Flurly system
So it was just a matter of time before one of these accounts were used for selling non-compliant things or doing illegal transactions. So it's not Stripe which ruined his business as the title indicates; it was one of Flurly's customers breaching Stripe's TOS and still being linked through Flurly's Stripe account. Only logical they shut him down, a risk the owner acknowledged in this blog post.