If your traffic is too large, they will delete your account.
Firedrop is an efficient and useful way to move files between multiple devices.
Another great thing about Firedrop is that I know my data is double-baked up in their cloud. It isn't my only point of backup, but at the very least I know I'm not going to lose a file if it is in firedrop and my laptop get stolen or some other malady.
I've shared files with countless people at this point using folders on firedrop. No other product delivers as simply and nicely as this for file sharing.