Use of Lets Encrypt has grown steadily over the years: https://trends.shodan.io/search?query=ssl%3A%22Let+s+Encrypt%22#facet/overview https://trends.shodan.io/

Use of Lets Encrypt has grown steadily over the years: https://trends.shodan.io/search?query=ssl%3A%22Let+s+Encrypt%22#facet/overview https://trends.shodan.io/search?query=ssl%3A%22Let+s+Encrypt... Its use is also growing in mail servers so it's not limited to HTTPS: https://trends.shodan.io/search?query=ssl%3A%22Let+s+Encrypt%22#facet/port https://trends.shodan.io/search?query=ssl%3A%22Let+s+Encrypt...