You have started with a conclusion and filled in the blanks with your personal opinions.
And you have not actually answered the question. Which is, "have you actually VERIFIED that popular apps are not recording your conversations?"
And you have not actually answered the question. Which is, "have you actually VERIFIED that popular apps are not recording your conversations?"
A potentially better option would be if some independent non profit security firm audited major apps every once in a while, monitoring network traffic and such.
I think the difference here is that apps getting uploaded to the app store have static analysis run on them looking for unauthorized calls. Still doesn't rule it out, but adds an extra check to the process.