Do se just not want money or something?

[Heavenchild]

Imagine an Attack on Titan or LoL crossover! Meeting Aurelion Sol in space or getting AoT glamour and stuff. People would love it I guess.

[Daeriion_Aeradiir]

square as a company have a good relationship with disney and disney as a company want as much money as they can get. people always claim disney wont OK this, but the reality is disney would okay and not only that but disney doesn't own sora, riku and kairi. they only own there own characters and a joint IP of KH. they have no say in what nomura does with his own characters

Actually, Disney in fact does own KH along with Square. Even the original characters of KH are a joint ownership deal.
Disney had to give the okay in order for Sora to appear in Smash.

In general though, a collab only works if the generated income of said collab outweighs the potential costs such a collab takes in order to make happen, otherwise it's not worth the dev time period. Most of FF14's collabs have occurred because the other IP is a wholly owned Square property (dragon quest, FF11, ff13, FF16, NIER(?)), Yoshi-P has been friends with the other guy (Makai, Yo-kai!), one of the devs from the other company is a fan of FF14 and approached Yoshi-P in order to make it happen (Monster Hunter). I.E, all very cheap or no cost to setup collabs.

If KH was ever a collab in FF14, Disney would almost certainly be expecting some sort of monetary expectation. The issue is that unless the collab was purely nothing but mogstation items, the monetary gain of people subbing back for the event likely wouldn't cover the cost Disney would even ask for, or Square would have to give up too much profit that it'd be a net negative. KH would likely only ever see a collab if Square somehow managed to convince Disney to approve it for free.

As far as stuff like FF7, timing is a very important thing when it comes to collabs. They're like discounts - you release them when you want to maximize sales by targetting specific crowds at specific times. Releasing an FF7 collab now would realistically only marginally boost sales of the FF7R games since they're old and not much hype is going around them. However, releasing a collab like that when the 3rd game comes out would systematically hit far harder in terms of performance, since not only is the collab rolling off the hype generated by a new game release, it would also boost sales of previous games on top due to the new game coming to end the trilogy so players will be more likely to buy all three games to play the full experience if they hadn't touched it before.

There is a ton of nuance to these things. Trust me from my own time working in the video game industry, these companies don't just hold stuff for the lulz. No for-profit company would actively deny free money, unless it believed it could make more more by taking a different choice. They understand there's a time and place to make sure release of such stuff hits the absolute hardest and maximizes profits when they do release stuff like it.

[Nero-Voidstails]

not gonna lie tho if they release a ff7 event I would do it just for the item I think that ff7 is overrated and is the charizard of SE