I had an older family member ask me "are you sure it won't go anywhere?" while I was encouraging them to use cloud storage such as Dropbox or Google Drive rather than a flash drive.
While I had naively never given it that much thought before, I wasn't sure the answer was "yes"— specifically that, if Dropbox or Google Drive were to shut down, they would give users the opportunity to take their files out.
I tried searching through their ToS but couldn't find any guarantees.