In the current situation where privacy in the network is in danger, it is okay to have some tools at hand so as not to rely on cloud services, for example to share files
Yeah, and what if you turn off your browser? Then the file won't be available.
Of course, since the shipping goes from your PC direct to the recipient, it is clear that both have to be online. But this is not a problem as big as it is more thought to pass one or more files to certain people, without having to upload them first to Dropbox, Mega or others. More control on your part about what happens with your files