https://na.finalfantasyxiv.com/lodes...94c46aae3781fa
TL;DR
Most of the items are un-giftable and those that are; are restricted in ways that end up being unviable for FC and Community event giveaways. The reasoning is cracking down on RMT. Mounts and minions specifically a question mark because the reason given is "in case they are already owned."
Longterm it's probably going to work out better, though they did shoot themselves in the foot recently (imho) since they also hurt the legitimate and largely involved community overal. Weekly, venues and free companies have been known to give away items from the store as incentive to attend. (I personally won a fat cat attire outfit that i gifted to a friend just before all this)
((edit: I need an Editor))