"once your text had been sent out to a third-party website, it could be snooped upon – but the victims of any snooping would blame the browser, even if it wasn'

"once your text had been sent out to a third-party website, it could be snooped upon – but the victims of any snooping would blame the browser, even if it wasn't the browser's fault." Please explain how sending my data to third parties is not the fault of the browser...