Thanks posting here in the Community! We'll gladly shed some light on the situation.
You can learn what personal data is collected by Spotify and how to obtain a copy of it by following the instruction on this support page. There you will also find useful info on your data rights and how to tweak your privacy settings.
If you would like to find out more about streams get counted and the usage statistics are done in general, you should contact our Press team. You can reach out to them via this page.
Hope you find this useful. Keep us posted if you have any questions.
Have an awesome day!
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“Music is a language that doesn’t speak in particular words. It speaks in emotions, and if it’s in the bones, it’s in the bones.” - Keith Richards