Hmmm....
I'm not as close to it as you've requested: I became aware that there was a successor to "est" operating in my country mainly because a portion of my old RP group got into "The Forum", but that was after I'd moved city. The most visible outcome was that one guy smartened up his life and repeatedly phoned one of the other group members (who he fancied) to go on the courses.
I'd venture that it's a blend of 1, 2 and 3, which is why it's hard to generalise.
I think it is a hard-sell pyramid scheme which gets people to a vulnerable state and then pushes them to "share the good things they've learnt with their friends and families" by getting them to pay the money and drink the Kool-Aid, too.
The product inside the packaging seems to help some people view their lives in ways which they find usefully different, though. It does this through a blend of guided discussion, reflection and challenge, and, well, body-hacks, mind-hacks and social-hacks aimed at bringing about psyche-hacks. If you're new to this stuff I imagine it could seem transformative. The whole process is designed to open you up so you question what you know or think you know, and so you'll be more open to taking on new ideas and approaches. As I understand it, it includes "rational" information, an emotional roller-coaster, mild-to-moderate sleep-deprivation, and generally there's social homework including calling your family and close friends.
This is not necessarily bad, but if you're like most humans this is aimed at it'll mean you become very vulnerable for a time. It's the application of (mostly-mild?) brainwashing techniques as a medium for personal development. (I'm using this term descriptively, not emotively, by the way, and I note that it's a fairly common part of ecstatic religious experience.)
I'm wary of letting anyone near me with that "hack" toolset unless I know and trust them, have reason to believe they know what they're doing and are on my side, and I'm pretty sure I've got solid aftercare. You'll make your own calls about those things, but at the least I'd suggest continuing with the preparatory research you're doing, making sure you have your own aftercare organised (because their "aftercare" seems to be a hard sales pitch), and considering doing whatever it takes so you won't be able to sign up for more of the Kool-Aid without a cooling off period (give your bank cards to a trusted friend who's not attending, for instance).