Not an expert but I'm inclined to believe the other side. David Ley is on XHamster's payroll.
Will Ley tell xHamster customers that every study ever published on males (about 70) links more porn to less sexual and relation satisfaction? Will Ley tell them that all 52 neurological studies on porn users/sex addicts report brain changes seen in drug addicts? Will he inform his audience that 50% of porn users report escalating to material they previously found uninteresting or disgusting? Somehow I doubt it.
This doesn't look like mere religious fundamentalism to me, it looks like there is a shitload of research that supports the idea of excessive porn use being harmful. Is it addictive in the sense that heroin is addictive, no, probably not.
https://www.yourbrainonporn.com/relevant-research-and-articles-about-the-studies/