This isn't specific to just netdata, but I frequently find projects that have some feature provided via their cloud offering and then say "but you can also do it locally" and gesture vaguely at some half-written docs that don't really help.
It makes sense for them, since one of those is how they make money and the other is how they loose cloud customers, but it's still annoying.
Shoutout to healthcheck.io who seem to provide both nice cloud offerings and a fully-fledged server with good documentation.