A relatively small portion of the domains hosted here has https and http2 enabled by an encryption certificate.
The primary advantage of https is so all of the data flowing between the web server and the web client is encrypted so can’t easily be monitored by a third party. A secondary advantage is that Google ranks https sites higher than http only if all other things are equal.
If you wish to have your domain https enabled, there is no additional fee for us, you just have to purchase a certificate from someone who sells SSL certificates. This would be used for Apache which requires certificates to be in the PEM format, although I can convert from most modern formats using openssl. An annual certificate for a single domain name + www.domain name is usually around $40/month. Contact email@example.com if you wish to pursue this.