Data from: Language structure is influenced by the number of speakers but seemingly not by the proportion of non-native speakers

Large-scale empirical evidence indicates a fascinating statistical
relationship between the estimated number of language users and its
linguistic and statistical structure. In this context, the linguistic
niche hypothesis argues that this relationship reflects a negative
selection against morphological paradigms that are hard to learn for
adults, since languages with a large number of speakers are assumed to be
typically spoken and learned by greater proportions of adults. In this
paper, this conjecture is tested empirically for more than 2,000
languages. The results question the idea of the impact of non-native
speakers on the grammatical and statistical structure of languages, as it
is demonstrated that the relative proportion of non-native speakers does
not significantly correlate with neither morphological nor
information-theoretic complexity. While it thus seems that large numbers
of adult learners/speakers do not affect the (grammatical or statistical)
structure of a language, the results suggest that there is indeed a
relationship between the number of speakers and (especially)
information-theoretic complexity, i.e. entropy rates. A potential
explanation for the observed relationship is discussed.