The developers of browser hijackers like Retellrule.com typically generate some revenue from the pay-per-click ads and links that are shown on your screen. This is why they set their software to constantly prompt you to click on different sponsored messages and visit specific pages by showing different pop-up notifications and redirect links on every website you visit. Indeed, these activities would not usually cause serious damage to your system, but they can interfere with your web experience and cause irritation. That is why you have the right to uninstall the software that is causing you disturbance and remove all its related elements from your browser (search engines, homepage changes, toolbars, etc.) in case that they are not allowing you to surf the Internet in peace.