I watched a presentation in which it was explained that they got Microsoft to create a version of Office for their metaverse and other companies to do similar things. I'm pretty sure that Microsoft is not doing this for free, so generally speaking I think their expenses include all the spending related to this kind of partnerships, which can add up to quite a lot when you have a whole ecosystem to build. This is not just software and hardware engineering. With this in mind, the $10bn figure looks much more reasonable and even disciplined for the goal pursued. Whether or not this goal is the right one is another question. I personally think Meta is misguided here and this aventure will fail miserably.