its basic supply and demand. the wealthy encourage mass immigration because it makes the cost of labour cheaper in the economies they run businesses in.
see: h1b visas and ultra pro immigration silicon valley companies
>as a foreigner that do not speak German
Nothing is preventing you from learning Hochdeutsch. It is a simple language. Easier than python, certainly.
The problem is not caused by these land lords or real estate owners, but broken USSR era govenrnment planning combined with extremely lazy and corrupt modern government. Berlin had higher population than today in 1938, and the city administration did not have any issues.
see: h1b visas and ultra pro immigration silicon valley companies