23andMe just tells you that you're a mix of every population that settled in your region and they define regions (East Europe, South Asia, etc) based on political borders and their subjective opinion.
23andMe tells me I'm 87.5% South Asian, 11.5% Middle Eastern, 0.4% Southern European, and 0.6% undefined. However, I get significant European admixtures on most GEDmatch calcs (~20%), and have never gotten more than 35% South Asian (South Asian is defined by different components on different calcs) on any calcs.
I posted my results in this thread in case you're curious:
https://www.theapricity.com/forum/sh...3andMe-Results
The lab just extracts DNA, it doesn't create a calculator.