Many different websites can be blocked. Often employers will block all websites that are not pertinent to the employees job. Parents often block websites that contain pornography and violence.
They block websites that would not be beneficial to their educational curriculum.
Schools block proxy websites because they do not want students to go on uneducational websites
It's all because of real world item trading.
Quite probably for the same reasons other organisations block access to websites. It is improper use of their network.
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You cannot block websites via Google Chrome internal's browsers. You can only do it by 3rd party apps in web store.
Schools are allowed to block any websites they deem not needed in education. Since this is a secular government and the role of religion in schools is not part of education they would be allowed to block the site. This would especially true that they blocked all sites and just not particular sites. Otherwise that would be discrimination.
not really