Source: Marketing Land.
Even as recent as a month ago, if you have been checking your Google Search Console messages, if your site was on HTTP, Google has been kind enough to inform you to switch to HTTPS because of these updates occurring in October 2017.
If Google’s messages have been ignored for so long, there is a good chance webmasters will listen now since there’s a high chance that having this “Non-secure” message will negatively influence CTR and cost potential business opportunities for non-HTTPS websites.
It’s clear that Google is trying a new tactic for webmasters to change and update their HTTP website to HTTPS by taking a more direct approach. However, it’s in the webmasters’ best interest because not only will they receive additional encrypted security on the site, they will receive a slight ranking boost and their site will have no “Non-secure” message on Chrome browsers. All for the relatively affordable cost of a yearly SSL certificate.
Example of the Google Search Console message: