Someone must have a Powerfest cart sitting in a basement and will never realise how much it's worth
Shenmue 3 does not have an embargo until two days after launch -
https://twitter.com/KochMed...
The people who backed the Kickstarter are getting what they paid for when they backed the Kickstarter. A copy of the game and whatever rewards tier they chose. This isn't a 'scam' or anything of the sort. Just people being entitled.
You could make arguments for both to be honest, it has quite a few strong RPG elements. Even Sega have categorized the rereleases as RPGs as well as Action Adventure on Steam, Playstation store etc.