I might be guilty of using an argument like that sometimes. What I really mean is that I currently value the convenience more than my privacy. “I’m using service X because that seems the most convenient choice for me and I don’t really care whether someone I won’t ever meet is reading my data. But I could also use service Y if it’s just as good and convenient as service X.”
Point being, I’m always willing to start using a different thing as long as it works for my use case as well as (or preferably better than) the thing I’m currently using.
So, instead of trying to scare me about someone spying on me, try convincing me how the other service works better than the one I’m currently using.