It's a downside if you want to just quickly go to something like kbin.social/m/kbinMeta for example. If I'm manually typing it, I may forget if the "M" is uppercase or not. What about the "k" since it's the first letter? I mean if I get it wrong, I just change the casing around or something.
For example sometimes when I want to find something new, I would just go to reddit.com/r/gamedeals and it doesn't matter if I put GameDeals or gamedeals. I still get sent there with no problem.
I don't think it's a massive downside, but I don't see how its an upside. What control does it give people? Whether the letters are small or big? Or am I missing something here?