> I think you overestimate the need for access to the OS for learning things. The cracking scene, demoscene and games industry was almost exclusively built on Windows. A lot of that was just as, if not more, advanced as what a Linux programmer does.
There was certainly a significant Windows (and DOS) demoscene, but to say it was exclusively built on Windows is about as far as the truth as one can get. Emphasis on Windows really only picked up in the late 90's; throughout the 70's, 80's, and early 90's, most of the demoscene, game development, etc. revolved around non-Windows platforms (particularly BASIC-running toasters in the 70's-80's, followed by Amigas and Macintoshes throughout the 80's and early 90's).
Windows 95 was the start of Windows becoming more popular for game development and multimedia production, but it took quite some time for Windows to displace the rest of the market (through Microsoft's monopolistic tactics, but that's another story). Until that point, there was DOS, but it was one of many contenders with relatively-equal footing only as far back as the late 80's at the earliest, before which DOS was more the purview of businesses buying IBM PCs alongside their IBM mainframes (in other words, about the most uncool computers one could possibly own). The reason DOS eventually caught on was very much because of how "open" (comparatively-speaking) it was compared to, say, Mac OS; the same subculture of BASIC programmers from the Commodore 64 days could make an easy transition to a similarly-minimalist environment requiring a lot of user intervention and therefore customization opportunity, much like how the world of GNU/Linux had been all the way up to the mainstream adoption of Android (and still is, though it's no longer an absolute necessity to be able to tinker with one's system like it was in the first half of the 2000's).
This isn't to mention that Windows didn't fully penetrate the educational market until well into the 2000's; most schools had a large quantity of Apple hardware still in use, thus influencing educational development. This was much stronger when the idea of a "demoscene" was still really relevant.
Now, the cracking world might have been different (I know DOS was a strong contender in the BBS subculture), but the latter two are very much not a product of Windows; far from it.
There was certainly a significant Windows (and DOS) demoscene, but to say it was exclusively built on Windows is about as far as the truth as one can get. Emphasis on Windows really only picked up in the late 90's; throughout the 70's, 80's, and early 90's, most of the demoscene, game development, etc. revolved around non-Windows platforms (particularly BASIC-running toasters in the 70's-80's, followed by Amigas and Macintoshes throughout the 80's and early 90's).
Windows 95 was the start of Windows becoming more popular for game development and multimedia production, but it took quite some time for Windows to displace the rest of the market (through Microsoft's monopolistic tactics, but that's another story). Until that point, there was DOS, but it was one of many contenders with relatively-equal footing only as far back as the late 80's at the earliest, before which DOS was more the purview of businesses buying IBM PCs alongside their IBM mainframes (in other words, about the most uncool computers one could possibly own). The reason DOS eventually caught on was very much because of how "open" (comparatively-speaking) it was compared to, say, Mac OS; the same subculture of BASIC programmers from the Commodore 64 days could make an easy transition to a similarly-minimalist environment requiring a lot of user intervention and therefore customization opportunity, much like how the world of GNU/Linux had been all the way up to the mainstream adoption of Android (and still is, though it's no longer an absolute necessity to be able to tinker with one's system like it was in the first half of the 2000's).
This isn't to mention that Windows didn't fully penetrate the educational market until well into the 2000's; most schools had a large quantity of Apple hardware still in use, thus influencing educational development. This was much stronger when the idea of a "demoscene" was still really relevant.
Now, the cracking world might have been different (I know DOS was a strong contender in the BBS subculture), but the latter two are very much not a product of Windows; far from it.