LetsEncrypt has made the strongest headway in large organizations with thousands of domains like Shopify, Heroku, website builders, etc. as it hits a really swe

LetsEncrypt has made the strongest headway in large organizations with thousands of domains like Shopify, Heroku, website builders, etc. as it hits a really sweet spot of usability (controlling the host lets them approve issuance), cost (free) and control (they can trigger mass refreshes).