Yeah Dropbox Apple etc. provide enough free or paid storage that shows you the true cost. Circa $10 for 2Tb. Cloudflare let's you host static files pretty much for free. Or cost is rounding error.

So you can run 1000 local first app that syncs to a Dropbox for that 10/m in storage. And that storage is full B2C level ready to go not some low level s3 like primitive. Has auth, has supported has programs to sync.

Really most of the cloud cost is not needed.