Whi is google chrome showing a not secure message even though SSL is installed?

Whi is google chrome showing a not secure message even though SSL is installed?

A lot of my websites are using the LetsEncrypt certificates, which are installed by default by CPanel.

The websites are accessible via https.

Chrome seems to be showing a "Not secure" icon for these sites.

Google does not sees LetsEncrypt as secure?
If not, then what is the point of that service?
And if its secure, then why is google not respecting that certificate?

Example sites:...

Whi is google chrome showing a not secure message even though SSL is installed?

from Google https://ift.tt/38xd8DU
via IFTTT