As of today, Google begins shipping Chrome 68 which flags all sites served over the HTTP scheme as being “not secure”. This is because the connection is, well, not secure so it seems like a fairly reasonable thing to say! We’ve known this has been coming for a long time now both through observing the changes in the industry and Google specifically saying “this is coming”. Yet somehow, we’ve arrived at today with a sizable chunk of the web still serving traffic insecurely .

Source: Why No HTTPS? Here’s the World’s Largest Websites Not Redirecting Insecure Requests to HTTPS