I was arguing based on the assumption that they are indeed doing what you described. RECs would be regulated and "not being honest" in that case would constitut

I was arguing based on the assumption that they are indeed doing what you described. RECs would be regulated and "not being honest" in that case would constitute actual fraud. If it's just a public promise, sure, I wouldn't trust them either, but even then German consumer protection laws would at least require them to either keep that promise or drop that claim (and pay a fine for anti-competitive practices).