https://torahlive.com/articles/halacha-teachers-articles/201...
The example of the copied mishna is ironic, because the plaintiff didn't write the selected parts, neither.
The comparison of IP to fish is a huge stretch. Illegal Encroachment is one thing but comparing people to fish is another. Still, I derived a new to me interpretation of intangible (as in not yet caught fish [and thus possibly not going to be caught either])
While the last example is rather topical, it contains no value judgement and still concernes tangible matters. What do the scholars have to say about reasoning by analogy?
Sure, the argument of upfront investment entitling to its fruit is compelling, but it's a slippery sloap init? Its from a time when selling people was a thing. I wouldn't give it too much thought. The article is very one sided and holier than thou in this regard for lack of a better word. (edit: forgive my ignorance, if the slave example is ill conceived)