What governs use
Learn has no separate terms-of-service document. The license in its repository sets the terms of use: Fair Source License.
From the privacy policy: The publisher operates no backend, account or inference service for it, and the plugin collects no telemetry or usage statistics.
License terms
Grant. You may view, use, modify, and run this software for personal, internal, educational, evaluation, and non-competing purposes, and may contribute changes back.
Restrictions. You may not offer this software (or a derivative) to third parties as a hosted or commercial product that competes with the author's offering, and you may not remove authorship or provenance metadata.
No warranty. Provided "AS IS", without warranty of any kind. The author is not liable for any claim, damages, or other liability arising from the software or its use.
The license also carries an integrity clause: graded assessments are never auto-completed and always halt for the human. Read it in full in the license file.
Source
The license text comes from LICENSE in the Learn repository.