I have read this on steam:

Warning about (unencrypted) data mining in Operencia: The Stolen Sun
https://steamcommunity.com/app/985950/discussions/0/2149847423918030101/

and this is a point to think about

are this the same shit in the gog version ?

I just checked and the game is reaching out to the Zenstudios server on the GOG version.

According to that Steam thread it is gameplay statistics, though it would be nice if there was an in-game way to disable it.

thanks for the info that this is also in the gog version ...

i wish too a disable option ;)