We anticipate that even with this update, third parties will continue

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The thing is, mounts are not a super big ticket item. Yes, there is the Lunar Whale at $42 as 8 people can ride it, Chocobo Carriage at $35.99 for 4 people, and 2 person mounts are $29.99, but most mounts are $24 with past event mounts at $12.
Of items still GIFTABLE: A story boost through Shadowbringers is $25. A Class boost to 80 is $25. The two newest outfits, Fat Cat Attire and Street Wear are both $22 a pop.
So, honestly, yes, there are SOME more expensive mounts, but most of them are less than stuff that is still giftable. This thought process in mind, there was no reason to lock mounts and minions down from being gifted to friends.