Czechs broke our hegemony of Portuguese speaking countries >:-(
But this is very good! It means better tests and possible⁽²⁾ better data in OSM.
Rules can be created for specific countries, areas (both as "knowledge area" or "geographical area"), tags, objects or whatever you want or need.
They could (and should!) be more and I am sure that every OSM community would benefit a lot with custom validation rules for their countries or specific needs.
⁽¹⁾ yes, I know how to count (sometimes, at least); both Portuguese rules should be merged into one in the future
⁽²⁾ possible because validation and testing isn't magical; it depends on who is analyzing and fixing the problems to have a good result