The technology is nothing alike though. Atom is Electron and Javascript where Zed is Rust with its own custom UI toolkit.
And on the current version of Pulsar (the only real community fork of Atom seeing active development), startup time to point of the editor being usable is actually slightly faster than VSCode.
On the plus side, the fact they stopped Atom development has allowed our community fork of Pulsar to flourish and it has seen loads of active development over the last year. I do find it hard to blame the original team, it was clearly a Microsoft thing to make sure they put all focus on VSCode.