Remember how Growtopia Forums used to be hosted on rtsoft.com? There are some remnants of that.
This thread dates all the way back to 2003. One thing I noticed is "support@growtopiagame.com". Growtopia wasn't even in its conception 16 years ago. I bet Seth used Ctrl+H to replace all rtsoft.com references to growtopiagame.com.

What's interesting is that you can supply any number between 0 and 555450 (currently) and it would give you a random post. Posts under number 1000 date probably below 2005.