This would be more exciting if the current steam/itch situation didn't rest (at least partially) on their shoulders as payment processors. Other people in the threads have brought up the lack of regulation and market capture that Stripe enjoys so I won't rehash those points here.

I can't see this as a positive because of how Stripe has behaved in terms of preventing transactions in the past. Although Tempo is behaving more like a b2b model or fintech-specific orgs in this case, the shoe-drop is when they decide a particular bank, or fintech org, or product is not allowed to perform the transaction on their network after the market capture takes place.