I don't care about all of these (or even take them seriously) but here are some reasons people dislike 'em:
-It isn't even a real corpo, it's just a clique of friends pretending
-The talent goes from complete cunts: Vei, Nyanners, Unlikeable: Silvervale, Zen, Unremarkable: Froot, and finally actually likeable: Melody, Ironmouse
-They frequently collab with fleshtubers, anitubers and just regular normies that some people fucking hate
-Some of them (Hime) have really poor/literally non-existent opsec
-A lot of people are still salty at nyanners so anything she's involved with is instantly hated too
-Vei has badmouthed hololive in public and doubled down when confronted
-They specialize in raunchy, sexually charged content that is often targeted at coomers and other vermin, their humour can sometimes be incredibly superficial due to this; aka the whole "peepeepoopoo" thing
-Zentreya in general, him using a voicechanger and pretending to be a woman (which for some reads as borderline troonery) and his dramatic freakouts in twitter as well as his weird past actions which im not that well versed in
-Their whole "talent freedom" thing, which many equated as a jab at hololive and other proper corpos and which essentially means unrestrained autism, and them using it as a fucking slogan
-Some people's tribalism at them collabing with holo and niji
-The whole nux drama which showed many people how bitchy and backstab-y a lot of them can be
-Their kuiper belt of orbiters many of whom are other unlikeable indies who also specialize in degenerate content
-The fact that they are so popular with normies and are the first thing a lot of western newcomers see when finding out about vtubers, which reinforces the idea that the whole medium is just another kind of degenerate porn.
-And finally, just their general influence on the scene and their rise to fame (or infamy) which has influenced a lot of indies to be less proffesional and adopt their twitch-like culture