You may not feel this way, but think of downloading docker, as a non developer. You are probably following some tutorial, and really have no idea what you are actually doing. What if a container you are downloading is dangerous, or becomes dangerous. What if the version of the platform you have eventually becomes risky, due to a hack/0day? You are basically downloading an entire OS/execution environment, that makes it seamless to run an entire environment, while doing nothing. How would the company send an email/warn you etc, of some basic info that could really help you, or make your experience better? This isn’t som H&M mailing list to take your money. This is real, marketing aside, maybe they actually care?

Yes, absolutely. Would you like the cure to cancer if it meant you had to give your email address? One thing has nothing to do with the other.

I think contributors are going to compile it from source, to contribute ?