Why do some providers require IPv6 /64 PA space to have public whois?

[mail at danrl.de (Dan Luedtke)]

Hi,

hmm, they get away with it once again. On the other hand their prices
stay low.

Off-topic but somehow important to me:
> HE has an open-peering policy (AFAIK);
> which basically means that tunnelbroker.net traffic is free for
> hetzner.de

Is that true?
That would be great!

Regards

Dan