I’d imagine you’d have a hard time using USB power banks to form a battery that resembles (for example) a MacBook Air battery:
Considering most power banks use 18650 cells or similar (but even if they are thinner), I can’t really see how you’d form a battery pack that fills the space effectively on most notebooks anyway.
It’s also a lot of work finding the correct cells to use (form and size wise), ordering them, if it’s in a power bank prying that apart, desoldering the old and soldering in the new cells. >= 99% of all people would purchase complete, fitting battery packs for their model of laptop.
So they “broke into Reddit” back in February and contacted Reddit in April. After Reddit didn’t react they contacted them again a few days ago at this very opportunistic time.
They never specified exactly what kind of data they stole, nor did they prove it by providing samples.
For all we know this story could be entirely made up and they actually have nothing.
But even if they have something, them trying to come across as the good guys in this is so weird to me. No, you’re not the good guys. You are criminals.