First challenge is too easy.
Like, after the naive solution try without if statement, then without switch statement, and so on, until you are eventually left with just a print statement (+ given for loop) :)
The FizzBuzz test might be very easy, but you are assuming that these challenges will be for people of your own skill level. Probably the site will want to cater for a wider audience, from beginner to advanced, and FizzBuzz provides a good starting point for both.
And anyway, we have all read enough about FizzBuzz to know that even "experienced" "professionals" can fail spectacularly at it.
I was expecting some kind of code-golf mark for that challenge though. There are many ways to solve it.
*: random figure