Not really. Action knew what Zuckerberg was up to. That's why he implemented e2ee behind Zuckerberg's back so he couldn't scrap users' data like he does with Facebook Messenger. To double back and remove e2ee would have caused lot of users to leave. You can't run finance/marketplace on e2ee because you need to know the flow of funds for money laundering regulations.

Brian made sure Zuckerberg couldn't turn Whatsapp into another Facebook: data hoarding to sell it. I think he regretted selling Whatsapp deep down. That's why he left a billion on the table. To show to himself he wasn't a complete sell out. That's just my take though.