The Fraunhofer Society is a research organization (tending towards the applied/engineering end of the spectrum), so the answer might be simply "because they can

The Fraunhofer Society is a research organization (tending towards the applied/engineering end of the spectrum), so the answer might be simply "because they can?". Beside that: if they can work out the economics of the process, why not? Waste disposal costs money which might shift the economics in their favour (as people would have to pay someone for disposal anyways, so they could as well pay the people who make new panels from old ones).