The abandonware I have or had got that way because: the developer lost interest, sold it to a competitor (who promptly killed it), died, got married, had children etc. I can only recall one that was abandoned because it wasn't generating enough income (too much freeware competition). In that instance the developer made the source available to current license holders. It was a utility rather than an application.
But it's all been Unix, Windows, OS/2, Linux, or Android software - no Apple software, unless you want to count NeXTSTEP, but then I'd have to count Tata's Elxsi, etc :lol:
BR
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