Founder of RudderLabs (RudderStack now) here. You nailed it - Control, Cost & Privacy (Data-Ownership) are the main drivers we have seen in people adopting us. Kind of related to Control is the whole drive to adopting open-Source technologies. We engineers always wanted open-source but increasingly larger enterprises are interested too - maybe to avoid vendor locking or maybe just because cool engineers (who grew up adopting open-source stuff) are finally getting into decision making positions.
Shameless plug - we wrote a blog on setting up an Open Source Analytics Stack with one of our deployments highlighting these issues.
It's really unfortunate how HN culture (awesome in most respects) forces you to use defensive phrases like "shameless plug" for sharing work that you are really proud of and the community is proud of as well
I wouldn't take the self-deprecating language literally. It's probably a useful signal. It communicates "I'm a genuine community member sharing my work with the community" in a way that is hard for spammers to replicate.
Shameless plug - we wrote a blog on setting up an Open Source Analytics Stack with one of our deployments highlighting these issues.
https://dev.to/rudderstack/how-to-build-an-open-source-analy...
PostHog looks awesome!! Congrats on your launch. Would love to collaborate and share notes.