They both agree to it. Seems pretty official to me. It's literally straight from the horses mouth. Given that the last two of Jake's "official" fights were cancelled, I think this is as official as it gets until they step into the ring.
Are you new to boxing? Agreeing to something on twitter is not a done deal nor is it legally blinding. I don't think KSI agreed to it either, just proposed it not expecting Jake to agree to it. Do you know how many fighters have agreed to fight publicly then one of them backs out or doesn't go though with it? Happens every month. Fights fall through even after both parties have everything agreed but just need to put pen to paper and sign off on it. Eddie Hearn says he's lost count of how many fights have fallen through because the fighters couldn't agree on something as simple as who gets to walk out first or who's name takes first billing. Two fighters saying they fight will on Twitter is just the first of many steps, and that's assuming KSI wasn't just chatting shit in the first place and just trying to get attention for his upcoming fight which is probably going to bomb seeing as he's fighting a nobody now and it's on PPV as well. Can't see many people paying for that.
I find it a little hard to believe he'd turn down $40 million dollars to promote anything, but if he did, good for him. It sounds like he's got bigger plans of making a whole lot more than that, which I wish him luck. If he turned down $40 million from Stake though, he's just plain dumb unless it came with some sort of no-compete clause.
I'm sure he's exaggerating the amount but it may have worked out to that over the contract time if a genuine offer. I believe Drake is getting millions a month from Stake so Jake would probably get a similar deal, but if Jake is starting his own company then why just take money from another company when you can make that and more with your own company? He has his own boxing promotions company and will get free advertising on all his and his fighters cards so it's a no brainer really. Why promote a brand when you can become the brand. He could easily become bigger than Stake the way he's going.
I've thought the KSI vs Jake Paul fight has been dead in the water for a long time. Jake Paul has clearly advanced beyond KSI's skill level. It would be a stupid fight on all levels. Jake Paul likely gets the finish, while KSI loses stock. I don't blame KSI wanting to duck that fight if the rumours are true. He would simply not benefit from it other than the share of the purse he would be guaranteed.
Jake Paul, despite what some might think of him has become a real boxer. He has dedicated the last few years to building a reputation in the sport, and while he might have cherry picked his opponents who doesn't when they're just starting out. Hell, I think big names like Joshua, and Fury cherry picked their opponents quite late into their careers. It's only now they're at the top level, they aren't so much. Although, Fury generally went for the more tougher opponents than AJ.
I doubt KSI would actually want this fight either and he's already coming out with excuses. He could have fought him in London but would rather fight a nobody. His upcoming fight this month is almost certainly going to be a flop. The only way I see KSI fighting Jake is if KSI has improved massively since the Logan fight, which of course is possible but with only one fight under his belt we have no idea. Jake has come a long way in a short period of time so there's no reason why KSI couldn't either. I think taking on Jake Paul might be a bit of a leap for him though. I'm sure Jake would happily take this fight though because he like knows or at least thinks it's an easy fight for him. The more wins Jake gets under his belt the more his stuck rises so he's going to be desperate to keep that winning streak for the big boys that will come sniffing around soon enough.