That's anecdotal testimony really isn't it? and it's not true for fintech startups, SVB doesn't even bank Stripe's core payfac business. Other than the namesake, most fintech payment companies use WF, Fifth Third, Chase, Comerica or Cross-River.
There's no reason Stripe's selection of a payfac provider should (strongly) influence it's selection of a corporate/startup banking bizdev partner. Atlas is linking companies up to regular corporate banking services.