Well aware of education/outreach programs for birds that for whatever reason cant be re-introduced to the wild. But i've never seen one used in a commercial capacity outside of the states and i'm certain they cannot be kept outside of a official capcity... That all aside the most realistic answer is likely the easy one the bird in picture is not infact a bald eagle exported from america to the netherlands to be trained in drone catching.
We have most of the big eagles in the UK. Keeping large birds of prey is not forbidden here. Hopefully going up to Scotland to see the sea eagles next year. They are bigger than bald eagles. There is a place not far from where we live that has a bald eagle.