Api and ota empty in configuration

When i look at the configuration (YAML) of my working ESP-devices i found out that api: and ota: does not contain any value:

# Enable Home Assistant API


why is it that way and why do they work anyhow without this settings?

Both just need to be there to be enabled. And while both have an optional password, i never seen ota without a password, but that can be down on how you installed ESPHome? Either way for ota i would suggest using a password or anyone can fiddle with your esp devices :smiley:

So, what could i have done to miss this feature? Is there a switch burried somewhere in the configs?
Can i check/do this afterwards?