I imagine this is a mix of things. UE5 has officially been out for a while, their biggest competitor just offed themselves, Fortnite's UE editor support is out and thus Fortnite probably doesn't need as many devs now with UGC to pick up the slack, etc.
That's still a huge chunk of people though. Wonder if all these financial gambles they've taken are starting to add up.
It's an eight year old smartwatch. I feel like most of the target audience already has a newer model.