There are security implications but what you are talking about isn't really feasible. The website needs permission and the picker is user controlled. A website can only access files/directories selected by the user. Saving/Editing is also another user prompt(once permission is provided for a single file it remains until the tab is closed).
So in order for what you are discussing to happen a user would have to give permission and open up a directory on the site then also hit confirm every time the site tried to overwrite a file. It's not impossible but there are notable safeguards in place to prevent this.
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There are security implications but what you are talking about isn't really feasible. The website needs permission and the picker is user controlled. A website can only access files/directories selected by the user. Saving/Editing is also another user prompt(once permission is provided for a single file it remains until the tab is closed).
So in order for what you are discussing to happen a user would have to give permission and open up a directory on the site then also hit confirm every time the site tried to overwrite a file. It's not impossible but there are notable safeguards in place to prevent this.