'What has yet to emerge is the most essential part, from Forrester's perspective: the interoperability needed to turn siloed metaverse spaces – spaces provided by individual tech giants – into a seamless experience for users. "The fully federated metaverse will contain standard protocols for the presence, persistence, and transfer of identity and assets," Forrester said.'
You mean like OpenSim and it's hypergrid protocol that allows you to travel to other OpenSim worlds, transfer identities and assets, and provide presence services persistently? We have been doing that for over a decade.
OpenSim is an open source clean room implementation of Second Life. The same viewers work on both. There are at least three VR viewers that I know of, I wrote one of them before the first Oculus Rift was released to consumers. So most of the things this "new" metaverse says it will be has been around for at least the 16 years Second Life has been running.
I even made a parody of The Zuckerverse metaverse that I call metaverse farted, any one on a hypergrid enabled OpenSim world can travel there. Their identity and avatar will be transferred there, then transferred back when they go home. They can pick up and leave any assets they desire. They can make friends with any actual members of that world (OK, there's only one member for now), or any other visitors from other worlds. They can get presence announcements for these new friends. The entire world will persist for as long as I decide to keep it running (I've been running OpenSim based worlds for over a decade). Any assets they take with them will persist for as long as their home world keeps running.
Only took me three hours to make that parody world. The Zuckerverse set a really low bar to get down to quality wise, I'm 61, I can't limbo like I used to.