AWS has over 200 services, so that's a little over $2 per service. Yeah, a lot of it is built on OSS, but there is a ton of it, and there is also a lot of work involved in building the APIs and web UI, and making it scalable , secure, and resilient.

Now, you might be able to make a version of some small subset of aws services that runs works ok for a small scale for with relatively simple needs, for that many tokens, but I don't think that's what they were going for.