/dev/bpf* requires elevated permissions?

[Sean-Der]

On macOS Monterey I have numeric interfaces

$ ls /dev/bpf*
/dev/bpf0	/dev/bpf1	/dev/bpf2	/dev/bpf3

But opening them gives a

Permission denied (os error 13)
-1 Permission denied (os error 13)         
-1 Permission denied (os error 13)       
-1 Permission denied (os error 13) 

Is that expected? Would you be open to a different implementation that doesn't require elevated privs?