Why are crowd-sourced websites considered unreliable?

most people are poorly educated.

they allow only experts in the field to provide information.

crowd-sourced websites do not have staffs to manage their content.

information on them is often not backed up with reliable sources.

Information on them is often not backed up with reliable sources.

Explanation:

Crowd-sourced websites are open for everyone to feed information to. Most of the people who feed this information do not fetch it from sources that are authentic and reliable. They either try to put up their personal experiences or the information they heard somewhere, someday. Very few who genuinely understand the importance of the correctness of information take efforts to look up for the information through reliable sources to answer the queries and questions.