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...
I've been hunting around searching for someone who is working on a bridge between IPFS and Nostr. I self-host all of the videos that I produce on IPFS before I upload them anywhere else, and the ability to plug in a CID into a video sharing service would be ideal. It's just a vision because I have no dev skills, but have you seen anyone working on making that connection?