It is twofold

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Part of it is that EVERYONE wants Windows. So obviously piracy groups are going to crack it

Whereas comparatively few people want a specific CAD tool. So piracy groups aren't incentivized to crack it.

Because if you actually read a .nfo file (that you obviously found in church on a sunday while minding your own business), most warez groups are obnoxious little shits who only care about the clout.

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The other aspect is that, for stuff like Windows, Microsoft doesn't actually care about piracy. They basically throw licenses at consumers for free (hell, I am still cycling through like four different keys I got during college). Because there is so little profit in what OS Grandma buys that it doesn't matter.

Instead, they profit off keys sold to the people who sell pre-built computers (so laptops and prebuilt desktops) who just treat that as an operating cost. And, more importantly, they sell bulk licenses to actual companies. And THAT is a lot of money

And you know what encourages Reynholm Industries to buy hundreds of Windows and Office and so forth licenses? The fact that their employees are comfortable with that OS and ecosystem... possibly because they grew up with an unactivated bootleg copy.