For awhile now SEO's have known the importance of https (SSL) for SEO, but it has not been entirely embraced. Back in August, Google started sending webmasters via the Search Console, direct messages such as the following:
"Starting October 2017, Chrome (version 62) will show a “NOT SECURE” warning when users enter text in a form on an HTTP page, and for all HTTP pages in Incognito mode.
The following URLs on your site include text input fields (such as < input type="text" > or < input type="email" >) that will trigger the new Chrome warning. Review these examples to see where these warnings will appear, so that you can take action to help protect users’ data. This list is not exhaustive.
(FireFox browser also does this.)