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It is not the same traffic pattern, Uber sees a regular stream of request keeping their caches warm, Yes they might see 2X or 3X spikes every now and them but in proportion these are smaller than the spikes that the IRS will see today.

From information on https://www.irs.gov/e-file-providers/modernized-e-file-overv... it doesn't seem to have been contracted out.

Where did you read about that ?

https://news.ycombinator.com/item?id=16852295