Happy to chime in here.
- If the program is winded down and no bugs are submitted/paid out on, the funds will be returned. We would ideally add smaller projects into this program so that there are multiple projects using this community bucket. Same rule applies in that if no bugs are submitted then funds would be returned to the foundation once program is shut down or deprecated.
- The bug bounty program is a continuous program rather than a point in time solution. Does this answer you question? Let me know otherwise.