https://thenextweb.com/security/2020/02/28/lets-encrypt-has-now-issued-a-billion-free-https-certificates/

HTTPS is now considered to be a base standard for website security. You can always check if a website is using the latest encryption standards to secure your communication by checking out its HTTPS certificate.

Let’s Encrypt, a site that provides such free certificates, has issued a billion of them since its launch in 2016. The non-profit is operated by the Internet Security Research Group (ISRG), with members such as Mozilla Foundation, Akamai Technologies, Electronic Frontier Foundation (EFF), and the University of Michigan.