The allegations have caused debate in the crypto community, with some accusing Coinbase of lacking transparency in its Bitcoin reserves.
The rumor was probably started by people working at a different exchange that is about to go under and they figured they could cause other people some doubt.
The funny part is that things like this are the reason that a lot of people want to go with BlackRock & Coinbase.
They have massive amounts of regulation to deal with and a ton of government people crawling though their books on a regular basis.
Although they might be able to get away with some things, the chances of them not having what they say they have vs other off shore unregulated exchanges is a lot less.
-Dave