Except, gambling isn't illegal here - in fact, it's very common. There are lots of casinos within a few mins walk in any city in Spain. All the prediction markets need to do is comply with existing laws.
For some reason, American companies have a really hard time following existing laws and regulations here. AirBnb and Uber both had the same approach of basically saying "Oops we didn't know" until the law (and others) cracked down on them, I'm sure someone could find older examples too, and surely tons of examples outside of Spain too.
Yup, totally nuanced comment coming from a completely sane person since "central planning regulatory hell" and "laissez faire economy without laws" are the two only options we have here, good job carrying the conversation forward with curious and interesting comments.
What? Maybe you visited a particularly casino-heavy area, but in general there aren't many casinos in Spain. In many regions (e.g. mine) they're restricted to one per province. My city (250K population in the core, metropolitan area about 500K) has one. Madrid (6M metropolitan area) has four, Barcelona (5M) has one.
Sports betting places on the other hand have multiplied like fungi in the last two decades, unfortunately.
You are incredibly naive. There is one on every street, they are just called "sports bars" instead of casinos.
You're probably talking about the big Vegas style entire-hotel casino that aren't so popular in Europe anyway outside a niche crowd. The average lower class Spanish person frequents these "sports bars" heavily