For new users I think we ought to authorize and access these servers by default. I know this was shot down before, but there really is no reason not to.
When you install guix you implicitely decide to trust its servers. I know no one who does not want to install the keys. I.e., everyone needs the keys installed anyway. So, why don't they just work and be part of the guix package? It is one of these areas we could do better with little effort. Pj.