Grammarly's ad links directly to an immediate single-click-to-install page for their suspicious browser extension whose fine print asks for total access to look at your private webpage data, keystrokes, ability to inject mysterious scripts into every single page you visit, including email, banking, cryptocurrency exchange login pages, etc. With over 10 million active installations, they could easily use this absurd amount of power to profit in a shady manner. The ROI for their ad spend must be incredible because the average tech-naive person just has to fall for it once and then this extension is installed for the remaining lifetime of their computer. The whole thing has a stench similar to the Hola browser extension botnet incident.