Why disable fsockopen?

Why disable fsockopen? It seems that many hosts have disabled & nbsp; fsockopen & nbsp; fpsockopen & nbsp; what can this function do? traffic, if fsockopen, curl, socket, and so on can all be used as a proxy, why disable fsockopen?
It seems that many hosts have disabled the fsockopen fpsockopen function. what can this function do?
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Traffic, fsockopen, curl, socket, and so on. you can write a php file for proxy.
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Fsockopen can bypass the http protocol to complete some work that may be illegal.
For the sake of security, disabling fsockopen is even more common.
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For security reasons...