If you've only recently started following the CS scene, then you probably miss a lot of "context" and "legacy" of what makes MIBR such a fan favourite team. Before MIBR ( formerly KeyD stars, Luminosity and SK gaming ) bursted out on the CS:GO tier 1 scene during their 2015 or 2016 major performance, can't remember which one it was, the BR scene was basically non existent. FalleN is basically regarded as "the Godfather" of brazilian counter-strike, and if it wasn't for him, the brazilian counter-strike scene probably wouldn't be anywhere near it is today. Also, again, people are fans of teams for various reasons, some people are bandwagon fans who just like the best team of their region / country, but MOST people are fans for other reasons. For example liking certain players, liking the legacy or brand of a certain team, maybe liking a team because they relate to them in a way, anything really. MIBR has more fans because they've been on the scene for longer and also have quite the legacy, something that Furia doesn't have (yet). Also incase you didn't know, MIBR had a year and a half and I think 3 majors in a row where they were basically undefeatable and had their own era. Not as good as Astralis now, but they were very fucking good.