No.
The Bluesky app respects Rob's setting (which is off by default) to not show his posts to logged out users, but fundamentally the protocol is for public data, so you can access it.
I just don't understand that choice for either platform, is the intent not, biggest reach possible? locking potential viewers out is such a direct contradiction of that.
edit: seems its user choice to force login to view a post, which changes my mind significantly on if its a bad platform decision.