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>how is this legal

Don't you remember reading about it in the terms and conditions?

To paraphrase an old saying - "Amazon is too big to do illegal stuff". They, and other megacorps, have transcended most of the plebeian laws and are slowly getting close to a full independence.

Legal via that EULA y'all clicked "Agree" on without reading.

Practical via monitoring network traffic density, and only using a small percentage of that (say, 1%).