I agree with the last part, the whole nostr ecosystem is kinda designed by and for bitcoiners and the main reason for this is that the majority of the demand for this protocol is from bitcoiners and like minded people.

Nostr is not that hard for normies to onboard, however you still need a bit maintenance to operate it, like picking relays, how to upload an image, how to verify nip-05. These maintenance issues are not present in other centralised platforms