Of course they did. That's because Dvorak and the rest of merry media at the time (early-mid 90s) bashed MS nonstop on features left out of the operating system.
So they kept adding stuff and adding stuff and adding stuff. Stac/Doublespace was just one of many.
My wife may complain that I need to make more money.
That's not an excuse for me to steal it.
Which is exactly what Microsoft did to Stac.