I've just spent almost two hours getting rid of the “Managed by your organization” notice in Chrome. There was a policy set, and - it took me a while - but I managed to remove that policy. I thought that might fix the issue. I'm still running some cleanup/detection tools to see if something is responsible for setting that policy, but so far, no result. I've uninstalled and installed once again, but still seeing the same message. Next step will be resetting Chrome to the original settings. I'll keep you up to date