Kbin collects all of that same info from Lemmy and vice versa (except for IP, which I don't think would ever be shared to begin with?).
The literal entire point of the fediverse is to share content in a public and interoperable way, so why are you surprised that a fediverse client would be collecting profile pictures and posts, when that's exactly what you'd need to do in order to display them?
Like, if you simply have no trust in Meta at all and refuse to interact with them, that's fine, but just say that and don't pretend it's because of the horror of displaying usernames.