Game development takes time. I don't understand how anyone can question this. FFXV was in development for 10 years and that game has a significantly smaller scope than the TWO GAMES that CIG is developing side by side. Like.. what's your point? Prey took 11 years. Duke Nukem, famously, 14 years. Shit happens. Games take time to make. That doesn't just automatically make them scams.
Flotsam, for instance, entered early access just over 5 years ago, and was a massively smaller game in scope back then. Today, its at version 0.8.5, and basically a completely different game. It's still not a scam.