Coinbase has been struggling lately. About two weeks ago, an ex-Coinbase product manager was charged with fraud over an alleged insider trading scheme involving crypto. Then last week, Coinbase shares dropped more than 20% after news broke that it’s facing an SEC probe into whether the platform is offering unregistered securities.  Even Cathie Wood seems to be losing faith in Coinbase. Her Ark Investment Management firm bought about $3 million worth of Coinbase shares back in…