I think you're right if you're only putting 1 sex worker and 1 porn addict on the scale, but I would imagine that for every sex worker there could be 100 porn addicts watching them, the math gets more tricky.
So, perhaps in an aggregate sense, there is more suffering of all the men men who are slightly stigmatized because they watch too much porn. But, none of them feel this as acutely as the single single sex worker who can 1) probably never get a more "legitimate" job again 2) may not be there of her own free will (yes, even if she is getting paid) 3) may not have any support network because her family has cut her off because of what she does (this is common).
The decision finds that the company used manipulation and intimidation to force young women into signing contracts they weren't supposed to understand which were contrary to spoken agreements.
This company was big (maybe still is) and isn't an outlier in the space.