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While I agree that as currently organized, a lot of business currently sucks, no other industry has such a problem with human trafficking as porn does. Human trafficking is, at least in my opinion, a crime that can be talked about in the same breath as murder and rape in terms of severity. It's basically slavery, and since it involves forcing people into sex work it's also rape. Until we can cleanse porn of that problem, there is no way I can feel comfortable saying the porn industry is comparable to clothes or whatever else. Nor can I say it has a huge net benefit to society.
You talk about the "net" benefit to society from porn, but do not talk about the negative effects it has. Porn has a few major downsides as it works today. 
First, the porn industry itself sucks. There is a ton of trafficking, even more taking advantage of vulnerable people, and most of the money goes to terrible people. A lot of former pornstars have called out the industry for it's problems, but nothing has really changed. We need a lot of regulations and updated ethical standards for porn production that have not been happening. Second, while porn does cause a needed release for some, it also leads to addiction and negative outcomes in others. People who consume too much porn definitely suffer for this in their personal relationships and social situations. And, on top of that, it can teach some pretty terrible lessons about sex ed and general expectations for sex. 
Now, I'm not going to say that due to all this that porn is bad and should be banned or anything. But I think it is at least enough to say that it's not a "huge net benefit". The benefits you pointed out are real and definitely big, but the weight of the negatives should be acknowledged as well. Porn is complicated, both good and bad, and discussions about it's impact on society need to be kept in that perspective if they want to be productive. >

In reference to your first point: you’re describing issues that happen w most industries as long as it’s possible. The clothing industry is (in a lot of instances) reliant on things like child labor and even people in work camps.
The issue of powerful people taking advantage of others isn’t really specifically an issue with porn, and while I absolutely think it’s something that needs to change, if you set that bar for “bad” as that a giant amount of (if not the majority) of industries are net negatives because people suck and will usually fuck others over for personal success