"That thing's copying the Mirage Box, right? Some big-shot alchemist made a blatant knockoff and sold it at the auction? Such disgrace!"
"Not really. I mean, it's fine as long as he made money from it. You know about Energy Stabilizers, right? Everyone copies them."
"That's different!"
"What's different? It's just a freaking music box, why does it matter, copied or not? You're just jealous, right?"
"I'm just saying that the music box isn't his idea!"
Usually, people in the wizarding world did not care much about "copyright issues". A copycat alchemist might earn some negative comments, but this would not prevent them from getting customers. As long as they got the skills to craft useful items, people still came to them.
Similarly, not many people in the auction hall were persuaded by the distrust directed at Angor.