They don't. 99.99% of what they are saying is conjecture because they dislike her but still wanna smash. These things they talk about aren't mutually exclusive in the real world, only in fiction. A person can genuinely like someone AND see a relationship as a potential career growth catalyst.
Content creators draw a shit ton of anger fueled criticism. They put extremely little effort into their work, they are usually the product of nepotism or good genetics, are useless human beings life skills wise, have neurotic crybaby personalities and get a sickening, undeserved and unfair amount of money and praise for what they do. Emiru is all of those things. If there is a god, content creators are his way of spitting in the face of everyone who works a 9-5.
Their brain is going "I fucking hate her" but also "I wanna bang her then cuddle with her" and the frustration that results in turns them into internet schizo posting detectives looking for anything to tilt the scale so they can escape that mindfuck purgatory.