[wheels]

I'd argue that you tend to see that happen in countries where the largest / most powerful speaker of that language is also the source of the language, such as French and German, and not in countries where the largest (in population) / most powerful (in size of economy) is not the originator, such as English (USA), Spanish (Mexico) or Portuguese (Brazil).

[101008]

La Real Academia Española rules the Spanish for Spain and Latin America.

[ajot]

More or less, there are many country-based language academies for Spanish, the first not-from-Spain being the colombian one. RAE now is part of a panhispanic community of Spanish language academies. That's why, for example, there is a "Diccionario panhispánico de dudas". You can read a little more about this at: https://www.rae.es/la-institucion/politica-panhispanica

[101008]

Yes, but that dictionary is from the RAE itself, so it is ruled by them.