

Copyright law is written as if magically duplicating the fruit is the same thing as stealing it. In a discussion about what the law is rather than what it should be in a sensible society, the analogy is fine. As Microsoft is the copyright holder, you only have the right to do anything with their files that they have deigned to grant you, and anything else is legally piracy. In the case of this specific link, they’ve granted the public the right to use it for evaluation purposes, but they’ve not granted any other rights, so it is legal to use the link to download the file for evaluation purposes, and illegal to use it for anything else.
If you want a slightly different analogy, it’s a little like how if Disney put on a free screening of the latest Marvel film for disabled children at a cinema, and didn’t check at the door, an able bodied adult could wander in, past signs saying that the screening was for disabled children only, and watch the film for free, but the fact that they could physically gain access doesn’t mean they had any legal right to be there. They could be ejected from the cinema and/or sued for the cost of a ticket and any legal costs. You do not have a legal right to click link on Microsoft’s website next to some text saying that it’s for evaluation purposes only unless you’re clicking it for evaluation purposes only. Just because you’ve made it to the link, it doesn’t mean you can ignore the text saying who is and isn’t allowed to click it.
The green slime was originally mouldy bin contents made of food waste from several days before. It was far from innocent.