Interesting article on Siliconera about Babylon's Fall borrowing assets from FF14. It seems that YoshiP himself offered some gear designs and emotes to the game to help out the budget and development process.
"I myself am a huge fan of online games, a gamer, and a developer. That’s why I couldn’t be happier if Babylon’s Fall succeeds and reinvigorates Japanese online games while boosting the number of players in the genre. So, I said, “Let’s use FFXIV’s assets too. We have so many, it’d be a shame to limit them to FFXIV alone,” and that’s how it all started. Back then, I didn’t realize that it would become such a hot topic…" - YoshiP
I imagine if we're getting another crossover at some point in the future, it may be Babylon's Fall that ends up returning the favour.
https://www.siliconera.com/ffxiv-emo...babylons-fall/