I think the more there are such platforms where you can quickly find information, the better. I use different resources and everywhere the information is different and it's good, so I learn different points of view.
Well, I think you can find these useful if you are a focus on researching on crypto related matters because this is its one unique features.
As for me, i always using google for first, and sometimes i look at wikipedia, some person make contribution at here but don't care this is right or not information ( especially at their own languages )... And they don't have quick update to who have a strong affect. WIKIBITS is onl for crypto world right?