Santa and the Easter bunny aren’t exclusively celebrated by one specific culture - ManaCube avoids the religious side of these holidays, as not to cause offence/arguments amongst the players - With Chinese New Year, it’d be difficult to create an interesting crate that would negate the “cultural” aspect of the holiday - while the older players may understand it, the younger members of the community may not. Christmas and Easter are typically celebrated for and by children, which is why it’s so easy to advertise/sell.
Thanksgiving and 4th of July I would definitely agree are quite exclusive, especially as I personally don’t celebrate either of them as I’m not American - however the reason these are included is because the server follows the American “traditions/ideals” in almost every aspect [definitions for rules, timezones for events/server releases, etc].
As I said, it’s still a very good idea, and I would personally love a Chinese N/Y crate - but I think it may have to be a bit more general, something like a “New Years Crate” - it’s possible that Dacon may love the idea and implement it, but that’s just my personal thoughts.