is it bulletproof ? I don't think peertube has fixed that massive legal liability to the "seeders"

same situation that bitorrent found itself in

If you only seed videos you have full legal rights to (creative commons [as long as you follow the license terms properly], public domain, or videos you personally created yourself, therefore own all rights to outright), then where's the worry? If you choose to seed copyrighted videos, well then that's all on you to handle the legality (or lack thereof) of I'd suppose... :shrug: