There are very many differences already pointed out, so to add an other one, there is a difference between a company doing something at scale and for profit, and a private person doing something for themselves.
The people in this community that says “copyright infringement isn’t theft” do not refer to copyright infringement where people exploit the work for-profit and put it out as their own (feel free to find a single occurrence to prove me wrong). The word plagiarism comes to mind, which is morally and (depending on country and circumstance) legally a bigger crime than copyright infringement. The legal system usually also recognize that exploitation done for-profit and large scale should be considered worse and punished harder.
The people in this community that says “copyright infringement isn’t theft” do not refer to copyright infringement where people exploit the work for-profit and put it out as their own (feel free to find a single occurrence to prove me wrong). The word plagiarism comes to mind, which is morally and (depending on country and circumstance) legally a bigger crime than copyright infringement. The legal system usually also recognize that exploitation done for-profit and large scale should be considered worse and punished harder.