This isn’t actually true.
The “Get certificate” option in the integrations page isn’t actually the integration itself. Just a way to get a certificate for it if you set up TLS on your MQTT broker. The MQTT integration is on by default and the data is unencrypted. And if you configure TLS then connect with the certificate the data will still be unencrypted as long as you are subscribing to the “application/…” topics. MQTT integration with application server - #3 by dv8