(disclaimer: I apparently have an IQ of 158. But god fucking knows I'm as average as can be.)
That's obvious from the fact that you forgot to mention the scale used and the test.
2) Anonymization of your data is really true
That has been shown to be increasingly difficult.
There is a lot of good data to be used to improve traffic in big cities for instance.
What does that have to do with a private taxi service collecting data on your movements? That's a matter for the municipal administration to solve.
The power day starts ramping up at about 5am. Your batteries will need to cover from about 5pm though 8am with little help, which means you will need a power capacity that approaches the peek demand and a storage capacity that covers at least half your daily consumption. This battery capacity will require that you double your collection capacity plus about 40% more to cover for conversion loss and battery losses.
Are we still talking about households, or about three-shift factories? Households do not have the same power consumption at night. Granted, if you live in an ancient structure with lousy thermal management and you're compensating for it with a AC without heat storage, then yeah, perhaps, but there's no reason in principle why you should be forced to be able to replicate your daylight power use with batteries at night.
"I am, therefore I am." -- Akira