100% you do not know how this all came to be nor have you followed the development closely.Just saw the game on hot steam releases. Despite the DRM complains they appear to be blowing up - normally their month to month gain is 200-500 this month its 3000 and still got a day to grow. They know how to make money. The DRM is not for the sake of itself, whatever money they gain from reduced piracy they need to pay in fees. No, it's to create system where they can sell people mtx. If there is one thing worse then mobile game mtx its porn game with mtx. When all the blood is in the dick it is hard to think and people need that blood so they will swipe!
It's kinda disgusting that people are rushing to give them money for a beta access to game where they will have to pay more for outfits/poses/animations what not. "your pledge amount will be converted to currency for upcoming online mode". How do they think that will work ? all the new stuff will come to the online mode and you will have to pay for it. With a bit of luck that will be direct purchase not lootbox crap but i wouldn't rule it out.
However i wouldn't worry that you about forced to interact with others - most probably it will be some password protected room type of stuff where you can invite others but 99.9% people won't.
They purchased a studio grade motion capture setup and paid a team, in Colorado, to do their mocap recordings. When Covid-19 broke out, the studio that was hired, quit working on this. A Japanese company stepped in and offered to do the work, free of charge, if Project H would use their new datacenter to test their infrastructure in a multiplayer setting. ProjectH said that the CEO was following their project. How much of that is true? Who the hell knows and you can believe it if you want. This "always online" side effect does help protect piracy but that was not their primary concern. Finding a studio, which would preform these sexual acts, was their problem. It's not like there are a lot of professional groups out there that want to simulate getting railed by a horse and Japan produces a lot of content that many western media companies won't touch. I wouldn't be surprised if it was DLsite that made the offer, as they get a special thanks.
So you earn digital currency, aka "likes" by being viewed by other people while you preform a scene. Scenes can not be purchased via currency; you earn them. Outfits will be purchasable.
Honestly, if you're worried about being forced to interact with other people? Player names will not be shown so you're friends will not know it's you wanking off. Just set your Steam privacy settings up, too, so Brian won't know you wank to this.