That's because you don't know how casinos work in Europe or how crypto casinos will have to work in the not-too-distant future if they want to operate there.
Europe does not operate the world, and I don't care how casinos operate there. There are 195 countries in the world, and Europe has 25% of them. Not more than a half. So, how casinos operate in Europe is irrelevant when discussing online casinos. I can run an online casino today sitting on my couch, and European people will be able to play in my casino without having any issues. I don't give it a shit to the government if they ban my casino or whatever action they try to take. All they can do is ban my domain name so their people cannot access it. They should know that the internet is limitless and nobody can stop people from accessing a website. Quote
I don't know about Russia, but a casino with a Curaçao licence cannot operate in Spain or in most (if not all) EU countries. In order to operate there, or offer its services to citizens there (even if it operates from somewhere else), it needs to acquire a specific Spanish licence, which is much more expensive and involves more paperwork than a Curaçao licence, plus if it gets the licence its operations will be supervised by the Dirección General de Ordenación del Juego from the very beginning.
and what do they actually do when it's an online unregulated casino? What did you mean by saying you cannot operate in Spain? I don't have to open an office in Spain to offer my service there. Anyone can access it. Nobody knows who the owner is. There are thousands of casinos online where European people are playing. 
See, you just don't get it. There are fewer and fewer casinos like cryptocurrency casinos from which you can play in Europe with peace of mind. In some you can't access them because the country's authorities block them. You can try Tor or VPN but many casinos block one or the other as well. In other cases it is the casino itself that blocks your access when it detects your IP. And the rest don't block you but they put in the ToS that you can't play from those countries but they turn a blind eye while you lose money.
It's not as easy as setting up a casino and offering your services in countries where you need a licence because you feel like it. You can get an international arrest warrant for tax fraud, that's why more and more houses have licences and put in the ToS that you can't play from those countries. when they don't directly block the players.
And it's not just in Europe, in the civilized world you need specific licences. How many crypto casinos do you see here (Australia)?
https://www.acma.gov.au/check-if-gambling-operator-legal