It’s been around for several years, maybe as long as Alby although don’t quote me on that. I remember trying it when I first heard about it but personally didn’t use it much because the UI was browser based and that weirded me out lol. I think with the other wallets shutting down in the US it has just been a natural migration of users, especially for Nostr users since it supports NWC.
Discussion
Ah so many it's just one of those things that looked like it popped out of nowhere but as you correctly point out it could just be my attention was drawn to it because it became popular due to migration. good point.
That’s how I view it, but I am still curious the answer to your original question about why others have shut down but they haven’t.
It remains an open question.
