The answer is simple: don't copy/paste commands, or at the very least review what you're about to execute after pasting. Reasonable terminals give you a warning

The answer is simple: don't copy/paste commands, or at the very least review what you're about to execute after pasting. Reasonable terminals give you a warning that you're about to paste multiple lines and let you read the text before okaying. Besides this is irrelevant. Websites have always been able to do what you're describing, because copying is a gesture. This bug doesn't change that.