and agree that there are some things that are default for a reason. it makes things easier to read. it's nice, neat, and a good contrast from the white background.
1. Yellow and normal font isn't as hard to read as what I typed.
Some people type like that and it's very eye-straining to read it. You're signature isn't as bad but when you start using really bright colors it starts to hurt. Signature's aren't as bad because you don't need to keep looking at them and they're more of a "profile" thing, while posts are always different and don't need to be fancy when all you're saying is: "My favorite villager is so-and-so."
Alright, personally, banning someone over font is dumb unless it's stated in the rules that you're not supposed to constantly use some fonts or markup, in which case it's fine since the person didn't listen to the rules. [Albeit excessive if little warning was given beforehand.]