You can mute the word Bitcoin, or mute the accounts talking about it if someone you follow keeps sharing their shit and you don't want to unfollow that person.
Nostr is for everyone.
Discussion
This mute option isnt for me. I still want to see other cool stuff there is evolving bitcoin. Muting will cause more harm then good in this case. But I do get where you come from. Thats somehow a start. I dont have problem woth bitcoin material on Nostr some is informative and you can learn from it but a lot of it is also pure kaka.