ISpot is supported by the Open University, which suggests it has an educational vision.
Since I joined several years ago I have concentrated on adding comments to Observations in my main area of expertise, Marine & Coastal habitats. My comments generally offer directions for a successful id, sometimes including a reference to journal publications, all of which I hope help the poster to improve their skills. The process of helping others usually improves my own understanding too, so a win/win situation.
The CHANGES feature allowed me to see if my comments had been followed up with a successful id by the poster, and importantly, if s/he, or anyone else, had further questions. This is standard educational practice; without the CHANGES option iSpot is severely devalued as a learning resource.