When dealing with websites the GPL is almost a liberal license. There is no requirement for a server operator of GPL'ed software to share the code with the use

When dealing with websites the GPL is almost a liberal license. There is no requirement for a server operator of GPL'ed software to share the code with the users of that software. If you want to copyleft the code and make sure ALL users of the software get access to the sourcecode, use the AGPL.