[walr000s]

At that number of observations, I would assume depth of market data so probably HFT use case. HFT is notoriously expensive to try to compete in

[moogly]

Or IoT data, which is notoriously hard to make money on.

[osigurdson]

Or someone using sound recorder on Windows.

[pgwhalen]

I'm no market data specialist, but that seems like order of magnitude just top-of-book for US equities? The equity options market, at least, is orders of magnitude larger.

[vegabook]

actually, any number of crypto APIs will give you tens of millions of points per day, for free (though that was not our use case).