Noncommercial is specifically related to making money from something, so in our case unless we choose to deny upvotes from our post, we shouldn't use them. UNLESS we ask permission. Email would count as evidence if they for whatever reason changed their minds.

I've emailed many scientists saying how I expect to make a certain amount of money from it and they've always welcomed it and expressed interest in seeing the final post. This is the best way to bypass the restrictions of law.

Regarding giving the rights to others, yes it would be like selling your rights to others but unless it's written in contract form with your signature it has little meaning and thus you basically still hold the original form - which is yours.

There's a lot of in depth answers you can explore in the USA FAQ which should clarify most things