Simple, easy requirements: WordPress 2.84. PHP4 or PHP5. Oh, and brains. ;)
Initial testing says yes.
Answer 1:
As per Yahoo's developer terms of service "all Web sites and applications that present data from the Yahoo! Answers API must show the attribution "Powered by Yahoo! Answers"." They are giving you unlimited access to Yahoo Answer's data for the cost of attribution to them. The moral decision is up to you, the software will not take care of this attribution text.
Answer 2:
Do you care?
Technically, the content will be ever changing as more is being generated every day by real human beings. Also, each Caffeinated Content user will likely be targeting different keywords, diversifying things even further.
If that fact alone doesn't satisfy you, you can take comfort in the knowledge that I have provided a few text rewriting options that will mish-mash your text so the chances of it matching anything out there is near 0.