ICMP policy for IPv6 (ISPs)

Hello all,

I have a brief question about policy for IPv6. We are working on research project to understand the adoption of IPv6.

Part of the paper tries to discover home users. I have around 130 IPv6 addresses in multiple ASes. However, only 8 addresses responds to ICMP messages.

Is there a policy or best practice to disable ICMP for IPv6 ? or I am just unlucky with the collected addresses.

Thank you in advance for any guidance or direction in this regard.