It’s the network effects that made Reddit valuable: the people, communities, 3rd-party clients, platform integrations, etc.
Most of these things are fairly portable, so I think Reddit execs are mainly gambling in users not wanting to bother with finding a new place to gather.
I have to wonder why they didn’t just start off charging reasonable prices for the API and dial things up over time. Crummy either way, but less likely to alienate literally everyone they depend on to make the system work.
Trivially? No. As can be seen by lack of alternatives of comparable quality.
N.B. I have no love for reddit. I generally hate reddit, the site. However there's a massive amount of useful content there.
I think that qualifies at trivial.
The quality differences are 100% due to the differences in the communities. They are social deficits, not technical ones.