All of this! Plus, from my perspective anyway, this has given a lot of people the chance to get their feet wet with other platforms and ecosystems.
While it may not be a majority, I do believe there will be well seasoned users that see how the whole thing was handled by Reddit, and see the potential in these other avenues, and stay in those new places instead.
So far, I would say I'm one of those users. After a decade on Reddit and decline in quality, I'm certainly happy to call a new platform home and grow with it.
Pretty much daily.
I work from home, and my work computer and personal rig share a desk - by the end of the work day, sitting in the same chair at the same desk to stare at another screen started feeling like a chore and I had all but quit gaming.
The Deck has changed that. Not only am I loving gaming again, but I've found myself playing genres I never would have on my PC (things like Vampire Survivors just feel great on it, but I had no interest in them on my PC)