- We did a prototype last July on saving 100M+ updates for $10/day all costs (cpu, disk, backup). Proof: https://www.youtube.com/watch?v=x_WqBuEA7s8
- You can 1 click deploy to a free Heroku server here: https://github.com/amark/gun#heroku
- Watch a demo of the GPS tracking here: 1min https://youtu.be/7ALHtbC9aOM
- Demo of the app here: (warning: asks for location) http://gps.gunDB.io/
- Source code here: (only ~200LOC, lots to improve) https://github.com/gundb/gps
As a professional developer I would say that its not trivial, at least not cheap to develop. Theoretically all problems you know how to solve are trivial. Professionally you know that developing a solution that is flexible, reliable, supportable, extendible, user friendly and maintainable takes time, expertise and money to develop.
Providing a middleman with this kind of information is a little too much trust for me to think in terms of cents per action.
Is there something in the protocol that makes it more efficient?
 We blogged about how we built out our variable frequency model: https://blog.hypertrack.com/2016/11/28/battery-efficient-rea...
According to the pricing page, actual use is US$0.04 per "action" (which they describe as "deliveries, pickups, dropoffs, visits, appointments or anything you may decide")
Step 1. Download and install Audacity and LMMS
Step 2. Get clearance agreements from the Jackson estate
Step 3. ...
Both Glympse and PathShare have fairly elaborate set of APIs on iOS and Android. Not sure I understand the distinction.