Learn Finnish: Täällä rentoudutaan, koska vaikka kuka saa perustuloa. - Here one relaxes, because anyone at all gets a basic income.

Rentoutua (to relax) is an intransitive verb, meaning it doesn't take an object. In Finnish, you can passivize intransitive verbs to express a generic, collective state or action done by unspecified people. It translates naturally to 'here people relax' or 'here one relaxes.'

How exactly is rentoudutaan formed from the verb rentoutua?

For verb type 1, the passive present is built on the weak vowel stem. The consonant t in rentoutua undergoes consonant gradation and weakens to d, giving the stem rentoudu-. Then you add the passive ending -taan, resulting in rentoudutaan.

I know vaikka means 'although,' so how does vaikka kuka mean 'anyone at all'?

When vaikka is paired with a question word like kuka (who) or mikä (what), it acts as an intensifier to create a phrase meaning 'any X at all'. Therefore, vaikka kuka means 'anyone at all' or 'literally anyone.'

Why is perustuloa in the partitive case rather than the accusative?

The word perustulo (basic income) is treated as an uncountable, continuous concept here, much like general money or time. Because the exact total amount isn't bounded or specified, the object requires the partitive case.