On the contrary, without patents we wouldn't have capitalism. Who's going to put a lot of time and money into developing new technology if anyone can simply copy your ideas?
Patents were introduced in the Middle Ages by Venice and copied in England under James I. Both states were developers of new technology. The first US patent act was specifically entitled "An act to promote the progress of the useful arts."
Obviously you can go to far. The US will patent things that other countries won't — ideas rather than actual technology.
As for intellectual property being a fiction, the law is full of fictions. Just think of the fact that IBM and Microsoft are persons under the law!
A bigger fiction is that money has value.
We could go on & on identifying such "fictions".
But it's pointless.
These things are useful. To call them "fiction" is mere
mischief, designed to argue against them by labelling them.
It reminds me of some believer's attempts to claim that atheists
have deep "faith" too, eg, that the sun will rise tomorrow.
Btw, corporations are not persons in every sense...just in limited ways.
For example, corporations cannot marry or vote.
But they may speak, & be represented in court as plaintiff or defendant.
It's a concept that dates back centuries. But the media have been very
effective in de-educating people about what corporate personhood actually is.