There are several reasons to prefer, well, anything at all for a public write file.
In essence, this boils down to the fact that there is a limited amount of damage that someone can do with the ability to push through the web method. On the other hand, the share of reading / writing is necessary for pressing, but also allows the user to delete all repos, history and everything.
Without even causing malicious intent, people (or rogue software agents) knew to go to random network resources and accidentally drag the file to where it does not belong.
The best reason to lock your computer is not because your colleagues find it funny to use an unlocked email account to send porn with HR, but because of its amazing thing, a cleaning lady can do with a rag and keyboard. It is also surprising that Music Library applications can find while scanning all the shares in the workgroup and carefully โmoveโ and catalog them into Someones library.
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