Does 2Do support collaborative editing or teamwork?

2Do does not provide cloud-hosted team workspaces or live multi-user collaborative editing across the internet. There are two closer options:

• Share Lists over Wi-Fi — on the same local network, one Mac can publish a list and others can subscribe and edit it, with changes syncing both ways. It's the closest thing to real-time shared editing in 2Do. The full publish-and-subscribe interface is on Mac today, with iPhone and iPad support in development. See Share Lists over Wi-Fi.
• A shared iCloud CalDAV list — anyone using the shared list can complete or edit tasks. This is shared task syncing through iCloud rather than a true team-collaboration system.

Neither is a hosted team workspace with accounts, roles, or permissions.