Industrial porn can be degrading work. It isn't always, and doesn't have to be. Also, not all porn is "industrial".
So can a lot of non-sexual jobs. Like burger flipping. Mail sorting. Coal mining. Hell, even some desk jobs. What matters is not the job itself, but whether you're made to feel like a worthless peon who exists only to be abused and have money wrung out of them, and be given a pittance in return.
There are issues around porn, but they seem to be caused directly or indirectly by 1.) lack of sex education, and 2.) male sexual entitlement. Get rid of porn, and many of the problems caused by those two things will still exist. Get rid of those two things, and the problems caused by porn will go away.
Objectification is not a problem so long as people are not objectified outside of a sex scene where they're meant to be objectified. It's also not a problem if you're objectifying a photo or a video recording rather than the person in them, since those are literally objects. It is a problem if you don't separate the person from the moment. Of course, the kind of person who most needs to know this is also the least likely to care about the harm caused by not making the distinction, but that would be a problem even if porn didn't exist.