[PaulHoule]

If you use a service like Amazon S3 or Cloudflare R2 you pay a certain amount for storage and a certain amount for bandwidth.

In a collection of, say, a few million images, you will have many that generate very little traffic but others that become extremely popular in comparison. You might be worrying about "how to pay to store less popular images" and "how to pay for bandwidth for highly popular images" at the same time!

If I can publish only webp I feel like I am optimizing both storage costs and bandwidth costs at the same time. Adding more formats can help with bandwidth but can only hurt in terms of storage.