They probably meant PB.

I would speculate that DOS 3 probably has some consultant code in it that they haven't got the all clear to release yet, that, or they lost the source code, lol.

Out of curiosity what systems do you run that require such an earlier version of DOS, is freeDOS not a sufficient replacement?

An hour at a high power station is too long. In reality, it's at most 20 minutes to hit an 80% charge and get back on the road. Might as well squeeze in a restroom break and a snack during that time. Most gassers do this anyway.

ha hha ha...a.... I'll show myself out...
<... looks at floor...>

Here are some screenshots of what installing MS-DOS 4.0 was like.

There's no trademark infringement. If there is no trademark infringement then they have neither ability nor obligation to pursue it.