All of those seem like valid criticisms against UBI, but is it an argument not to do it? Are those issues non-existant without UBI? Take your third point - what do we do with people who spend all their UBI on drugs and gambling? Even though the “you’ve had your UBI the rest is on you” approach seems morally wrong the current situation is that they get even less or zero help anyway so UBI would only be an improvement for those people.
Maybe add more restrictions to gambling (and reclassify things like trading/investing as partially gambling), and keep policing drugs as usual.
Also, mandatory warning attention-abusive mediums, such as casinos and mobile apps; and stricter regulation against misleading advertisement. And greater scrutiny of lobbying..
