Yeah, I don't disagree, there are problems with it for sure. But at least for language learning in most languages, as a beginner you're probably just trying to

Yeah, I don't disagree, there are problems with it for sure. But at least for language learning in most languages, as a beginner you're probably just trying to get yourself to a B1-ish level in your target language before switching over to (easy) native content. The quirks of regional pronunciation and idioms can come later. And having some resources is better than having no resources, particularly when we're talking about languages without much in regards to learning materials. That's where a dataset like Tatoeba could be helpful for training ML models or being used as a base for learning apps like Clozemaster. For a language like Portugese, though, you already have Assimil courses and many levels of Pimsleur, etc in both Brazilian and European dialects to get you going. There looks to even be some FSI courses, if you're coming from English. Again, I do agree that it's weird they have both European and Brazilian Portugese mixed on Tatoeba, whereas for Arabic, where many dialects are also not mutually intelligible, there are different categories. I wonder why that happened.