It's not even a new thing... re Skunkworks. It's completely natural for new/developing technology to be formed in new organizations separate from incumbered corporate bureaucracy. iirc, IBM did this with the PC, that later languaged under the bureaucrats, and there are many others over the past half century.

I think the biggest issue with Meta here, is how much visibility they have to adjacent orgs, which is not too surprising given the expenditures, but still surprising. It should be a separate unit and the expenses absolutely thought of as separate from the rest of the org(s).