Feel free to discuss those DO's and DONT's though if I'm not quite catching your drift.
No, you're right. The main points would be the MP3-less engine, and that a game is not based on an established IP. But also, just to cover ourselves, it might be handy for potential developers to keep in mind the various stipulations that are attached to free or royalty-free resources they may decide to use. From fonts to sound-effects or music, if you source something for free, make sure to keep track of who it came from and whether it's free for commercial
use, requires a credit or permission, or is covered by a Creative Commons license (or some such).
As most of us probably know, the copyright pitfalls involved in producing a commercial game, as opposed to a freeware game, are significant, and just making them clear ahead of time might save us potential trouble.
Hooray for Captain Buzzkill! \o/