...it's still a real concern with a pattern confirmed by a double-digit number of girls.
As everyone else has said, the OP is terrible. Your evidence is a random bunch of out of context cropped screenshots, some of which are censored, a lot of which you can't even see who is saying what and could just be random anons shit stirring, along with a 'letter' sent to his family which mainly is "some YT dude is a dick sometimes", the most damning thing you seem to have is that he apparently hit a girlfriend but there is no proof of that. You mention sexual abuse but really didn't mention anything about him sexually abusing girls in your letter.
My favourite bit is: "Let us add that this relationship in many countries would be considered as pedophilia."
So, by that you mean what he's doing ISN'T pedophilia where he lives, because he's English and their age of consent is 16... so him being with a 17 year old (when he was 23) isn't illegal... which was also 12 years ago apparently. The fan 'falling in love with him' at 15 makes literally no difference to the story apart from you trying to get under that 16 year age of consent, but her feelings to him at that age mean nothing if he isn't fucking her. If this was also your point for him being a groomer, that's not grooming. Him being a celebrity and just his existence makes a girl want to sleep with him before she hits the legal age, that doesn't make him a groomer. You don't even imply they had any form of communication when she was underage.
But then you randomly claim he is attracted to "pre-teen girls"... but call him a hebephile, but if he's interested in pre-teen girls he would be a paedophile, but you provide no evidence again.
Your point also really loses some weight when you're complaining about him "leaving" lots of girls. Surely you should be celebrating that? Instead you sound upset about getting dumped.
The main points seem to be:
1. He's 35 and likes being with younger girls (10 years younger than him... which is 25, not even an unreasonable age gap)
2. He may have hit one girl, once.
3. He's an emo attention seeker (One look at one of his videos told me that)
4. He's not a good friend to people (Refer to point 3)
5. He dates fans. So? They're all adults. They're consenting to being in a relationship with him. So what that he earns more than them?
6. He 'coerces' them into being in a poly relationship. You do realise they could just break up with him and say no? And if that's the best you have, that he convinces the girl to let him cheat on her and she agrees, you really don't have much.
7. That you aren't willing to do anything apart from cry to his mum to stop him dating 25 year old girls... and if this mum won't do it, you want KiwiFarms to do... something?
This is not shocking that Boyinaband is a weirdo, like I said, one look at him confirms he's a weirdo.
I wish I hadn't looked at that but at least it kinda confirms that the OP and their "group" (if one even exists) are a bunch of jealous ex-girlfriends who are upset they were fuck buddies and/or dumped.
A diss track by an ex-girlfriend who rants that Pewdiepie is a Nazi so he shouldn't have collabed with him, that he's somehow a racist for... not being nice enough to her I think, being jealous that he was hanging out with other people and not texting her enough, all wrapped in the nice bow where she claims she's such a great SJW (her own words) that she can beat him in all of his arguments and if your Youtube isn't about Social Justice you're being "stupid" (her own words).
There's literally nothing to it. There isn't even any abuse. She comes across like a fuck buddy who was upset she never reached girlfriend status and he didn't give a shit when she was ranting at him about SJW shit because he dared hang out with white people. When your main arguments are you being upset that he didn't look like at you like a queen and didn't text you back quickly, you're probably the mental one.
The description of the video is even better since it is full blown "Why didn't he like me enough? Why'd he stop texting me back? How DARE he speak to Pewdiepie when he'd stuck his dick in me?!?! Was he not even THINKING about me?!?!?! He criticised INDIA?!?!?! BUT I'M INDIAN!!!!!!"
What a shit show.