>>936996919 (OP)Basically it's a one-two punch of anime waifu hotness and a "personality" that the tuber cultivates, not unlike an anime waifu. Each VT has their specific "personality" and sexual kinks that are on clear display for the viewers to latch onto. Some are S, some are M, some are of the LGBT variety.
And unlike real women streamers, these gals actually play games for reals. So while people watching streamers like Amoranth foe the ass, people are watching VTs for the entertainment and waifiu appeal.
The entertainment is a combo of reaction material, comedy, friends goofing off with each other, etc. This grows a fan club via parasocial interaction where you feel like you are hanging out with a real woman. (female streamers just feel like SFW camwhores).
Most of the stream is boring slop. Hence why you get clips and compilations of the good bits. That is how people get grabbed and then invested.
As for the simps, simps just love investing in women for no return.