Flare prevent's itself from deleting your videos because ideally, we aren't the ones hosting them. To be self-soveriegn you should be the one to host your own content and ensure it will persist. Flare and Nostr acts as a discovery layer on top, allowing people to find, comment, like, and zap videos that have been shared with the network. There are alot of great devs working on solutions to more robust self-hosting of media (cc @hzrd149 ) but Flare as a project is strickly focused on the distribution and UI layer on top.