/vt/ - Virtual Youtubers

>>4597449
UOOOOOOOOOOOOOOOHHHHHHHHHHHHHHHHH ToT

Sorry in advance if this is the wrong board for this shit, I haven't touched this website in years and I'm surprised enough that "4channel" is now a thing, but let me just jump into it.
Long story short after breaking up with my girlfriend and losing my job I moved back in with my mother and younger brother.
The last time I saw my brother in real life, 3 years ago, he was this happy 13 year old kid with good grades and a girlfriend. He liked anime but whatever so did I at his age.
However now that I see him at 16 it's like he's a different person. My mother is like this helicopter parent and doesn't see anything wrong with him staying inside all day what with Covid on the loose however I see it differently.
First of all his room is trashed, and absolutely littered with posters of this vtuber, Gawr Gura (I had to google how to spell her name after he told me).
It'd be one thing if they were normal posters, but a lot of them are blatantly sexual (the picture I uploaded is basically how some of them look) and you can tell he hasn't had a girl in his room in a very long time because if she saw all of this loli shit you'd know she'd be creeped out. Again mom sees no problem with this says I liked the same Japanese anime stuff at his age.
Secondly I think he's using this girl as a substitute girlfriend. When I jokingly asked him when the last time he had a girl in his room was he just said something along the lines of "dude have you seen western women these days? fuck that shit" so clearly he has no interest in actual girls his age anymore.
Thirdly I worry that he's spending WAY too much money on this girl. I mentioned the posters but that's not all. His laptop that he uses to watch this girl is riddled with stickers of her that say shit like "shrimp" or just pictures of her blushing or making other faces. Clearly he's obsessed so I ask him what the appeal of this girl is and he says "cute things are cute" well yeah no shit. I obviously wasn't satisfied with that as an answer so I ask again and he jokes again saying "I'll send her a super chat asking her to explain it to you". First I ask WTF is a super chat, he explains it, I ask if he's been sending money to this girl and he just laughs refusing to answer. I know he's just a teenager but I don't want him to get sucked into bad spending habits like this.
Another thing I worry about is that he's skipping school to watch this girl. I don't have any hard proof of this but one day I peeked in his room when our mom said he was doing online school and lo and behold he's watching Gawr Gura. I don't know if he just had her in another tab or what but considering how he used to be so focused on school this seems like a change for the worse to me. Also this might just be a Covid thing but he's gained weight and the only time I see him go out is to run to the store. I don't know if he has any real life friends at all now or if they're all just online vtuber buddies of his (he mentioned being in a discord for them once).
Should I confront my mother about this or should I step in as his brother myself? Do I even need to or is this just how teenagers are these days? Any and all advice is appreciated.