Great article. I wrote about a similar experience 9 months ago while switching from Google Cloud Storage to Scaleway Object Storage:
https://pellegrino.link/2021/05/31/scaleway-object-storage-s...
Similarly, I saved about x100. For sure, the services do not offer the same level of guarantees and speed but depending on my case it was worth a migration.
Looking forward to trying Cloudflare R2 soon!