I doubt it will break walled gardens. Why should Meta/Facebook create the only Metaverse and why should they care about interoperability (probably not feasible

I doubt it will break walled gardens. Why should Meta/Facebook create the only Metaverse and why should they care about interoperability (probably not feasible anyway)? My fear is bigger walled gardens (metaverses) and services / devices that you cannot use anymore without being connected to them. Fans of decentralized things should worry.