[yomly]

I mean there's an old anecdote about how Chess was seen as dangerously addictive.

In any case, I think making something that is emergently addictive or addictive because it is fun is different from engineering something to be addictive by liberally lifting from all the years of research that went into slot machine design.

I don't know whether you frequent casinos but if you sit in the slot area for a while then compare that to big budget mobile p2w games (including Clash Royale which is actually also fun) is quite alarming. There are so many design similarities that lootbox games are basically slot machines without needing to pay out money...