Just as a basic sanity check, they claim to store 560 million pages of pure HTML. Internet Archive estimates the median HTML weight of a page to be ~20kb, which

Just as a basic sanity check, they claim to store 560 million pages of pure HTML. Internet Archive estimates the median HTML weight of a page to be ~20kb, which I fudged to 30kb in order to make a liberal estimate. Multiplied by the number of pages that would amount to approximately 16.8TB of data stored in s3. According to the AWS pricing calculator that would cost between $300-400 per month, and that's in s3 standard tier pricing with no intelligent tiering set up for less often retrieved data. I didn't bother calculating the compute cost for their rendering because I don't really understand how they do it, and also because the storage estimate was so far off of their claim that it didn't seem necessary to bother in order to refute the claim. I appreciate your challenge for additional evidence, and this is what I have to offer in response. I won't pretend like I did an exhaustive scientific study, this is more back of the napkin type stuff FWIW, but here it is.