You've described a solution that puts the cost/work on the provider. IPFS and BitTorrent shifts that to the consumers.

€50 per month for 50TB of traffic = 50 mio x 1MB file downloads. The costs are so low, that CDNs are practically free. Oh wait, CloudFlare IS free for such primitive use cases.

You ignored the costs of labor.

Not that it matters, my point stands. The cost exists and different solutions put it in different places.