Why? It's really great.
because fandoms loving suck, it's all just annoying people pushing their interests on others. imagine if i just walked around with a blockland tee-shirt and saying random blockland memes to people who didn't get it. That stuff would be annoying and would represent the game in a bad light, causing people to dislike the game before they know what it is.
There's a difference between "hey, i like this thing." and "hey, you should come see this thing because it's great and you'll love it what do you mean you don't you just don't get it let me explain it to you for the next 3 hours because it's so great and i'm going to clamp your nipples down and suck the juices from your torso because this thing is so cool and it's great."
fandoms, more often than not, are the latter.