It looks quite seamless from first glance. Was eventually going to happen I think given how
much time people spend on these platforms. Instagram influencers will have an easier time and may perhaps forgo Shopify-built sites for the sake of simplicity by routing fans to their Instagram marketplace. Can see YouTube introducing YouTube-shop to keep people within the Google ecosystem and compete with Facebook.
Could subvert Patreon in a way also. The implications are there I think.