I would only ask someone being so harsh, what they have personally contributed as a project directly or indirectly (supporting an existing project) before being

I would only ask someone being so harsh, what they have personally contributed as a project directly or indirectly (supporting an existing project) before being as harsh or judge mental as this, especially toward a product like docker, that probably revolutionalized an industry. To clarify, I mean popularized an entire paradigm of running software, not necessarily the first.