For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Seald - Keep your conversations secure, everywhere.
Dropbox - Online Sync and File Sharing
Keybase Chat - End-to-end encrypted chat built into Keybase
Google Drive - Access and sync your files anywhere
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Mega - Secure File Storage and collaboration