Does the switch even have the capability to support a mictrotransaction focused shell game? The store is incredibly slow and obtuse, where these things rely a lot on smooth, fast transactions to get it over with before people can think too hard.
Store looks like a webpage that gets opened in Switch's browser.
They do have a concept of filling up your store credit and then spending it on purchases, so the future microtransaction flow could just grab a few credits that you already have on your account.