I would say that it can be both. It’s a disgusting paraphilia, as are all paraphilias. But some people can keep their perversion private and not let it destroy their lives. So, for the ones who can’t control it, something similar to addiction could be at play. Just like, some people can actually do a metric fuckton of drugs and not ruin their lives, but others cannot. Whatever issues drove the drug use/paraphilia are one thing, but another thing is perhaps the propensity for addict behaviors.
When troons describe their “gender euphoria” they seem to me to be experiencing a physical feeling of brainjoy like when you get an endorphin burst while running or when you save like five hydros after dental work and enjoy them at your leisure, except with them it’s dress go spinny-ing.