no they don't, windows takes up enough ram as it is, it's most likely a Linux or a mac server.
Are you loving kidding me?
Not only do Macs use up more RAM because they preload a bunch of stuff (explains why your programs start up faster!), but RAM is barely even an issue unless you have a computer from like, 2003. Blockland has a memory limit. It really doesn't matter if a Windows computer had 16 GBs of RAM and used 10 GB of that. It wouldn't affect Blockland's stability in the slightest.