For years now, there has been some concern about the coziness between technology companies and the government. Whether a company complies with casual government requests for data, requires a warrant, or even fights overly-broad warrants has been a canary in the digital coal mine during an era where...
I for some reason recall at one point WhatsApp’s encryption was actually an audited implementation of Signal’s encryption. But that is so long ago that I doubt that holds much weight now ¯\_(ツ)_/¯
Even it they (WhatsApp) still provide reliable E2EE, they have lots of metadata that is not encrypted, and that they actively share with their “advertising partners”.