It's a fully client-side app with one HTML doc and one JavaScript file, both of which come back with 304s once you've been there once. I'm willing to bet the monthly "infrastructure costs" are less than the cost of a pizza.
I didn't know that. Thanks for the pointer. So it is 7 requests, 122kb in total. It had 2 million users last weekend according to https://www.theguardian.com/games/2022/jan/11/wordle-creator.... So this is about 250GB of traffic. Yes, you are right this is not a lot of traffic once you get served the first time.