Cool! Good to hear that.
I have some familiarity with the legal landscape of databases in Brazil, which is mentioned in a very streamlined way in the Wikipedia page you mentioned. It is somewhat similar to the United States in requiring a creative step.
So, if you take a list of all of the members of parliament, for example, one could not possibly argue that an “intellectual creation” that involved the “selection, organization or arrangement of content” to produce the list. I think it’s safe to say it is in the public domain.
On the other hand, a list of the most effective members of parliament could possibly be argued to be protected, as one might say that the way you choose to measure effectiveness could be considered an “intellectual creation”. Of course this argumentation could be challenged, but the legal status of this other example would not be as clear.
Fortunately, what we need for a project like Every Politician are comprehensive lists of all of the politicians, not filtered or arranged in any particular way. So in countries that have similar criteria for the protection of databases, we should be good to go.
Other legal aspects we should be concerned about is personal data protection regulation, such as the GDPR in Europe. Since data about politicians could be considered personal data, even if it is in the public interest, it is important to consider whether if that kind of legislation would impose restrictions on processing or distributing that data.
Disclaimer: Anything I say here or anywhere else is just my own personal opinion and does not constitute legal advice of any kind.