Earlier quoted context omitted.
It's not about hardware really. The hardware is just to sell the service in the best way possible. They had to make it. Because there was no good affordable standalone headset so far. The metaverse idea is all about the platform/service. I'm a big VR fan and even I'm not sure whether the metaverse will take off. But without hardware like the quest 2 it wouldn't have a chance.
The service is key, but I somehow doubt they will open their platform to 3rd party hardware like Valve. imo The hardware is just as important.
But I think once (or, if) the metaverse has proven its value to the consumer their goal is to be the leading platform and opening it up would make sense there, it would be key to maximising marketshare. Especially as they're not even making money on the hardware, it's being sold at a loss. That'll change too once the platform proves itself but still I don't think they expect it to be a major money maker.
Zuckerberg mentioned in his keynote that they want to go for a different business model. They want to sell the platform and enable creators to sell their designs, taking a cut in the Apple store way. And they can still take a cut on third party hardware by licensing. Which means revenue without even having to bother manufacturing anything.
I think hardware to Meta will be what hardware is to Microsoft. Setting a good baseline standard, promoting new designs and usecases (e.g. the surface pro convertible) and directing the market. But not being the sole vendor.
But I may be wrong of course. It'll be interesting times ahead!