Beginning to wonder this myself.
In the last couple of years, Vinpower has released or announced “Plextor”, “Optiarc”, and “Piodata” (Pioneer) drives that are actually the same LiteOn mechanism with Vinpower’s own custom code that mimics some, but not all, of the features of drives from these defunct product lines. Do they have the original source code base as a starting point? Or have they hired firmware authors from the original manufacturers’ teams? If not … what is the point?
I am reminded of consumer electronics badged with defunct quality brands (Westinghouse, Emerson, Fisher, etc) which are just licensed labels that imply nothing about what’s inside compared to the original models of old.