The premise of the question is to open a discussion about software that lives in a de facto state of being completely open source.

just because you and maybe two others here thought Tailscale was "fully" open source doesn't make it a "de facto" thing ;-)

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As opposed to asking whom on a hodgepodge full of strangers?

That was my point. The question itself makes very little sense, as the answers are not representative. (see above). Unless of course you just want to have a a discussion, for the sake of the discussion, which is of course fine :-)

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As opposed to not opening a discussion where erroneous information is not brought to attention...

Well, the problem is that your premise is purely anecdotal. Or to put it another way, you could list any closed source software here because someone in the whole wide world has probably mistaken it for OSS ;-)

Yeah, sure, but my comment wasn't great today, and the comment that was downvoted and that you're criticising, while not particularly nice, actually contains more useful information than most of the other comments.

Yes, the comment is not nice, but also not wrong imho. I mean, what's the point of the question? OP got wrong or inaccurate information from random people (probably on reddit) and is now asking random people on reddit if there are other things that random people on reddit are giving wrong or inaccurate information about ;-)