Earlier quoted context omitted.
That's a completely unhelpful, overly simplistic straw man argument. We restrict certain activities and places in the real world from certain people all the time. For example, not allowing people under 18 or 21 (depending on your country) into casinos. What we have now is essentially unrestricted access to pretty much anything and a fair assessment is that there is societal harm from that. We're creating gambling add…
>> "We're creating gambling addicts (which is arguably the most harmful form of addiction)" --- I will need a source, because "arguably" is a very broad umbrella. "Arguably" heroin addiction is the most harmful addiction because heroin is the most addictive substance, clouds judgement and drives the addict to all manners of sociopathic behaviour (not only theft or prostitition)
Heroin addiction was largely created by the criminialization of cannabis (the first so-called War on Drugs under Nixon) as a tool to persecute black people and war protesters and the overprescription of opioids (eg the Sacklers/Purdue).