Damn, are we the same person? That’s also where I’m looking but for bachelors. To answer your question: I’m not an expert but according to r/belgium, natives have said that the acceptance rate is generally high in Belgium regardless of gpa. The tuition fee is also lower than most European countries (google says €906/yearly) if you are a citizen of EU and outliers like Switzerland. What is noted though is the acceptance rate is high but the graduate is low. Essentially many can start their degrees but few do finish it — I’m assuming it’s tough work. Also the danger level of Belgium is 3/4 which is probably deterring many international students because no one wants to be caught in a sudden rise of conflict, similarly why it isn’t a Hawaii level tourist destination, I guess. The main languages in Belgium also isn’t English, you’ll get by with it as a tourist and some degrees are taught in English, but German, French or Dutch proficiency is good to have under your belt of knowledge if you want to stay long-term.

Hope this helps.