Because you monolinguals will never be hired in Europe. At least we have more options. You have no option but to work in Anglophone countries.
Your pea brain can't handle multiple languages.
No one has any plans of moving there to begin with; it's a downgrade. No one likes living like packed sardines taking 20 grocery bags on the metro every Saturday morning
Why would they need to learn German or Flemish or Romanian in the first place? Better to learn Mandarin or Spanish