The feeling of chasing that high, which scientists can show physical evidence of through brain imaging, isn’t present in people who self report porn addiction. What they’re calling addiction is frequently just enjoying masturbation, which they feel shame about, and that any amount is too much. If what people are self reporting as porn addiction neurologically doesn’t behave as an addiction, then therapies for addiction are not going to be evidence based treatments.
The people you’re talking about with cum jars often don’t even see their behavior as a problem, much less labeling themselves addicts. The overlap of the circles of people who masturbate in public and those that call themselves porn addicts is near zero. Calling all of that porn addiction is basically lumping all problematic sexual behavior together with people who think they’re part of that group because they look at porn and masturbate.
The professionals that treat porn addiction are also for the most part members of religious organizations that promote religious based solutions, which also doesn’t really offer much evidence against the idea that porn “addiction” is religious based shame.
The porn industry itself being exploitative of the workers is a completely different conversation than someone being “addicted” to porn.
I get that anyone who says they have a porn addiction isn’t having a good time. But we can’t ignore that there is a huge industry of religious quackery that is more than happy to take your money and tell you that you’re oh so sick, just as your shame and guilt tell you.