The amount of tech workers migrating is minuscule compared to the number of unskilled migration coming from countries like Syria and Afghanistan to Berlin. That is where the demand shock on the housing market comes from.
> number of unskilled migration coming from countries like Syria and Afghanistan to Berlin
These people cluser in the city districts ruled by Middle Eastern organized crime (if you ask Germans, no such phenomenon exists). There, market forces don't apply and housing market is hermetic to the outsiders - and it doesn't matter because you wouldn't want to live there.
Then cancel you rental contract, rent something new again and now... if not homeless (or stuck with airbnb)... re-estimate what the decent salary would be.
Mr. Big Shot