Client developers should be free to push whatever agenda they wish!
OK, I’m being slightly facetious. In reality you’ll get transparency because if you’re not getting it, you’ll move to a client that provides it.
Discussion
And that's what I love about nostr. I'm currently using 5 clients very much interchangeably and if I had the slightest suspicion one of them was trying to do shady stuff, I'd stop using it and be loud about it. 🤙