Read my comments, and the answers to yours: UBI is the a flat playment for everyone, but most existing social services have vastly different costs depending on many factors, including age.
The only way it would work was if UBI was calculated as the maximum payment needed by the most needy person. But then there would be no incentives to work for the vast majority of the population. No one producing is no one paying taxes, so no UBI.
That’s the “idea”, but there’s no way this would be the end result.
You’ll find the odd case of someone who instead of paying their health insurance decided to gamble their income or spent it on drugs. If UBI truly replaces public health, these people won’t have health services. There’s a snowballs chance in hell that you’ll be able to sell this politically in the EU.
Again, that's not what UBI will be. It wil be a social program, health care being public in all EU countries will be apart. Also worth noting, you cannot be not insured in Europe. Drugs have nothing to do with that neither, all German drug addicts have health insurance.
It can't really replace health care. The system works because people who don't need it as much (young people) pay for it. If they can choose not to, the entire system falls apart.
The only way it would work was if UBI was calculated as the maximum payment needed by the most needy person. But then there would be no incentives to work for the vast majority of the population. No one producing is no one paying taxes, so no UBI.