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Self hosted version would make this much more appealing since all of that calculation would be done in real time on your own devices. I agree this would be ideal. Why do they need the data in the first place? What makes that data good for anything other than marketing?

Exactly. Every time I see post about gyroscipe here on HN I am amazed by such beautiful design and prezentation. I really like their location visualizations. But I am simply not willing to upload such personal data to some company.

For tracking my locations I use simple android app called GPSLogger which saves my location into files on my sd card (not sending it to some others copmuters).. and for visualization would like to have something like gyroscope but working only locally or self hosted..

Doubt it, that would go directly against every revenue model that have set up. Also it would be serving a tiny segment of the market.