Except that not all industries are unionized so workers' exploitation is rampant, especially in low margin, low wage industries like fruit and vegetable picking, meat, hospitality, etc. where most of the migrant workers end up. The exploitation of migrants during Covid was even documented on DW.

Through work, I once had to vist one of the biggest meat plants in Germany, and nearly half the workers were Polish, and the other half Romanian. I asked them if they're unionized, they said 'no'.

Q.E.D.