It’s only used by them and their buddies and basically only for OTR conversations related to their publicly traded company that would have put them in prison. Totally the “let’s defraud these investors and do industrial espionage” type shit. I also know about a good half dozen other VC-funded E2EE chat apps that are also exactly this.
They do it just to get something they control in app stores that’s also a separate entity. Then they don’t have to answer uncomfortable questions about why such and such is on their phone.
This is some of what regulators are seeing and finding a problem with.