Netlify is making a significant change to its platform by automatically requesting a Let's Encrypt SSL certificate for all new sites, enabling HTTPS by default. This move aims to increase the security of the web and follows browser vendors' trends, with 75% of page loads now being over HTTPS. Netlify has ambitious goals for this year, including having all custom domain sites use HTTPS and all subdomains include HSTS headers by September 28th. To achieve these goals, users must ensure their site's URL links are HTTPS, and those without HTTPS set up will receive notifications. Additionally, users can submit their site to the HSTS Preload list for faster loading times in major browsers.