I'm currently using Zola as my static site generator and I'm looking into ways to store and serve images from. There are options like Cloudflare's R2 (S3-compatible), Cloudinary, or even a site dedicated to images and hotlinking to there. God forbid that the solution is committing binary images to the Git repository.

Do you have any recommendations that are portable (e.g. easy to switch vendors) and inexpensive, preferably free at the start?