You may not...
Host any sort of illegal content.
Distribute copyrighted materials.
Make malicious scripts that can damage the user, or the server. Such as creating malware, or making lots of files on the server at a fast rate (write-breaking).
Use the server as a game server, botnet, or any other "non-website" related activities.
Your site must...
Be under 100GB in size.
Not violate any of the Rules.
From Yuri Kuznetsov