Scorpi

Uber наоборот переехал с постгреса на мускул.
eng.uber.com/mysql-migration/

Commercial users are welcome to use Let's Encrypt for commercial and for-profit purposes. This is an intended use; we don't have any desire to restrict the use of our services to non-profit or non-commercial purposes.
community.letsencrypt.org/t/are-they-limitations-on-who-can-use-lets-encrypt/687/3