The issue is not just the gambling mindset of the daytraders but also the very instrument that they trade. CFD's are not regulated nor are they traded on central exchanges. They are traded OTC basically with the broker on the other side so it is also very prone to market manipulations and unfair dealings as the traders are trading directly against the brokers on the other side and can only win at the expense of the brokers. In essence, the traders were almost set up to lose. This is actually the bigger reason if not the biggest reason for the losses of the traders that the article should have focused on exposing instead of blaming on the gaming mindset of the traders, imo.
Trading itself is hard but if one is working with regulated financial products that are traded on central exchanges, at least one would have some possibility to win but with those CFD's, the chance is virtually zero. This is not trading or investing; this is almost fraud.