Photolibraryd writing a lot of info to disk - Whats causing this?

[Phat^Trance]

Can someone explain to my why the Photolibraryd process is writing so much data to my drive? I have around 40k images on my library on my icloud thats been synced with all my devices, and all been indexed a while ago, but the Photolibraryd is somehow still writing a lot of data to my disc, without me even opening the photo gallery on my mac.
I take around 5 - 10 photos per day nowadays with my iPhone.

This is how it looks like the last 48 hours stats (121.85gb written to disk)
:

https://i.postimg.cc/sDnhxX6S/image.png

 

[appltech]

It does a lot of "magical" stuff on the background. For example, it "scans your photos and videos and gathers them into collections called memories". Also, there's "People", "Places", etc.
I have no idea how exactly or how often does it scan images, perhaps it re-scans everything when a new photo is added.