All E2EE does is keep the general herd of users safe from malicious insiders and script kiddies. It's valuable but doesn't make these apps worthy of the catch-all "secure" descriptor.
For anyone worth targeting, there are so many options available to actors with moderate resources. They will pwn your OS with an RCE exploit; or interfere the next time you update that "E2EE" app via Google or Apple's servers; or your laptop will take a few seconds longer to reappear at airport security; etc.
Marketing messengers as "secure" because they use some derivative of the Double Ratchet is like your bank saying your funds are secure because their website uses TLS.
For anyone worth targeting, there are so many options available to actors with moderate resources. They will pwn your OS with an RCE exploit; or interfere the next time you update that "E2EE" app via Google or Apple's servers; or your laptop will take a few seconds longer to reappear at airport security; etc.
Marketing messengers as "secure" because they use some derivative of the Double Ratchet is like your bank saying your funds are secure because their website uses TLS.