Earlier quoted context omitted.
I am not sure if SMB is used over the Internet by "customers".
It's heavily used over VPNs. I have seen SMB over the internet by [ill-advised] companies but the various waves of exploits have probably put an end to that. The main point was just that something like SMB or NFS is not a good fit for a network which is not extremely fast and highly reliable because too many programs do blocking I/O. Dropbox works really well in that situation because it's asynchronous and that advan…
I wrote "customers", not in the sense of "companies". With the later ones I get paid to wait if I have to use SMB.