Gitbutler is backed by git. Gitbutler is essentially just ui for git which also allows you to have multiple branches. It isn't meant to replace git.
Not quite - it totally takes over your branching strategy and locks you into GitButler.
So.. worktrees?
What does that even mean? Multiple branches is a git feature.
"Backed by" as in "running git under the hood", not as in "supported by the git organization". I'd probably use "powered by" in this case to avoid confusion