I use B2 and Wasabi because I don't like relying on a single cloud provider. Files are uploaded to both. OpenResty (Nginx+Lua) sits in front to provide caching, and the logic for deciding which provider to pull from.
Wasabi gives you a free bandwidth allowance equal to the number of bytes stored per month. When I use up most of that, I start pulling from B2. And of course, if one of them is down, I pull from the other.
It's more time up front to build instead of just relying completely on GCP/Azure/AWS. But I don't have to worry as much about spontaneous account terminations destroying my business.