I am but a humble Shrimp.

[Moonface]

No, they haven't as far as I'm aware. As part of their contracts, I'm pretty sure they are unable to reveal their true selves. Although from what I've heard, you can find information about who they are due to leaks and such online. There's a group people refer to as "Antis" that pretty much make it their mission to try and expose and ruin the careers of Vtubers. Kind of pathetic on their part, really.

Also some people seem to know who Gura is due to her previous work. Hololive doesn't just hire random people to vTube, they actually hire talents. I didn't look into it because I really don't care about it, but some people I guess recognized Gura's voice from her previous YouTube channel before she got hired by Hololive as a vTuber.

The English girls have it a little easier than the Japanese girls do though, because they don't have to deal with how the Japanese fans are. You'd think there wouldn't be a similarity between them, but the Hololive JP girls are basically held to the same standards as Idols are in Japan, and if you know anything about the idol industry in Japan, you know that the fans are extremely toxic. Idols in Japan aren't allowed to have boyfriends, because they have to remain a shining image of absolute perfection for all the delusional fans who think the idols exist solely for them. For some reason the Hololive girls in Japan are also held to this standard, so revealing themselves would be a big no-no because it'd shatter the illusion of them actually being these cute anime girls in the eyes of these Japanese fans. Whereas over here, we see a vTuber like Gura and we're like, "Oh, that' really cute", but at the end of the day we're not sitting here thinking that this little anime sharkgirl is real and we know there's a human being behind it.

Also let me quickly be fair: I'm not saying all Japanese fans are like that, but the specific group of them that are, are so terrible that they will ruin the careers of idols if they find out she has a boyfriend, or has had a boyfriend, or has done anything that isn't "seiso" (Japanese word meaning like pure). Even something as simple as finding out that one of their precious idols has kissed a boy in the past would be enough to send them into an absolute frenzy and get her career ruined.

Jeez, I didn't know that was how idol stuff works to that level of detail. I guess that helps in not having someone abuse their position, along with it not just being anyone who is on Hololive as a streamer. I don't get the impression from your post but I guess the Japanese fans who impose an idol culture on the Japanese HL girls don't also do the same to the western ones?