1. Fibery is not better that JIRA (or is better). JIRA is focused on software development, while Fibery can cover more areas and more processes. It really depends on your needs. For example, Fibery has no integration with source control yet. However, documents integrated with real work processes better than in JIRA.
2. Fibery is closed source.
3. We try to keep Fibery a broad product and so far we think our competitors are Notion, Coda and Airtable. Not Gitlab.
4. Yes, you can. Note that Fibery has no automations so far (only Zapier and API), it means some cases will be hard to have. Like email communication via Fibery with automatic linkage of all messages to some Account. You can check more info here https://help.fibery.io/en/collections/1831852-map-your-proce...