> Dopamine withdrawal is real though and if you no longer get dopamine from an action or you physically prevent yourself from receiving that dopamine

Exactly, this is why the idea of addiction is more appropriately focused around the actual real world impacts rather than specific chemical mechanisms- the difficulty quitting and the negative impacts on your life. If it's strong enough to overpower your will and destroy your life, that is sufficient, it doesn't matter exactly how.

When it comes down to it, something like an amphetamine drug or other stimulants that directly increase synaptic dopamine, vs a behavior like gambling addiction that exploits the brains instincts and wiring in other ways to still cause the increase in synaptic dopamine are not fundamentally, categorically different in a way that one or the other shouldn't be taken seriously and considered a "real addiction." Either can completely destroy some peoples life, and for other people can be easily controlled and used in moderation.