I have created an interactive search spreadsheet that filters columns based on the user input and the data from another sheet. Since the user needs to be able to enter values in the search cell, I had to make the spreadsheet editable by anyone, though I locked everything but the required cell and the "chat" sheet.
The problem is that it does not prevent users from creating empty sheets and over the years over two hundreds of those accumulated there. I don't know why it's happening, whether they are created by bots, malicious users or are a byproduct of searching (though they weren't appearing when I was testing).
I'd like to find a way to remove all the empty sheets and, preferably, prevent them from appearing again.
This is the spreadsheet in question.