It is pretty small when considering content output. It is only 11 million people, and only a fraction of them will be writing something that could be used on training datasests. If you look at the countries by scientific contribution, for example [1], Portugal is on the 28th position, while Brazil is in 14th by more than double the number of contributions.

Don't get me wrong, it is definitely impressive given Portugal's actual size, but I believe there's a hard limit for population and size that will be difficult to cross

[1]: https://en.wikipedia.org/wiki/List_of_countries_by_number_of...