Kind of a non argument here.
Roon is a commercial entity. Selling services comes at a cost. Deferring costs by profiting from services rendered by volunteers is expressly forbidden in the EU.
There are two reasons for this, both closely linked:
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By doing so, the commercial entity avoids having to pay wages or fees and by doing so takes away social security contributions. This undermines the social security fabric in Europe.
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Doing so is distortion of competition. It gives an unfair advantage over other companies that do pay for the services they need.
As for the use of artist pictures, it is evidently so that the photographers deserve payment for their pictures.