Many, if not all, of the aforementioned synths are no longer in production and can only be purchased through the second-hand market (e.g Ebay, Reverb, Craigslist, etc). While I'm all for supporting the official developer/manufacturer, I don't think it's really possible to directly do that simply by buying it off another musician's hands. Not only that, eventually the parts for repairing/maintaining these older synths will become harder and harder to find. Eventually, they'll either be left in the dust or they make the jump to software sooner or later.Or, if your intention is just to produce a song, in this case the correct behaviour is to try the emulator with a specific rom, then buy the corresponding hardware from the manufacturer.
Never say never as it would be fun to see Arturia or one of the big plugin developers to jump on any of these synths, but as far as anyone can tell atm, this is literally the only project that is devoted to these old-school synths.
TLDR: I agree with Music Engineer. I understand questioning the legality and I certainly wouldn't want to see any of the developers go out of business -- Waldorf has already had some experience with that -- but I think it's neither here nor there with regards to these synths or the very nature of this project.
