As with every similar heavy-handed approach to enforcement you are making life difficult for the 99% of regular, honest users while the remaining 1% can trivially bypass it.
I disagree, corporate systems will try to be transparent about being a corporate device. And they will not particularly be avoidant of software licensing, they may refuse to use the software, but they'd rather have that than use unlicensed software.
It seems like this makes things easier for everyone?
Given that paying for WinRAR is still a popular meme, these percentages look inaccurate.
The post doesn't say what you should do with this information. You could just remind the user that they're supposed to buy a license for commercial use.