I played #Destiny2 for a few months during the Final Shape era. This news of it shutting down is not surprising - it was by far, the worst first-time-user-experience #ftue that you can imagine. Nothing made sense.
It's hard to say, but I think they left millions and millions of dollars on the table by just abandoning player onboarding. What came after Final Shape was just them nailing their coffin shut.
I tried #MarathonTheGame during the free week and frankly it's an amazing game. The onboarding is much better than #Destiny2, but it's far from complete. It still needs much more. I really hope #Bungie learned from Destiny2 and focus on FTUE this time. I hope it picks up steam, it's frankly a beautifully executed play experience once you get into it.