They collapsed, because they couldn't deliver anything remotely close to what was promised. IMO they knew all along it was a fraud and just kept the story going as long as they could.
I think they renamed themselves "sonic energy". Excellent thread on eevblog:
same thing that happened to theranos, just in a lower-key fashion; they hadn't figured out how to do the thing they said they'd figured out how to do, and possibly nobody ever will
in my book that makes them a fraud, though there are clearly a lot of ai company founders who disagree
