It's not law but going to hurt your ISP to not give at minimum a /64 way more than it's going to hurt anyone else as everything is made to make doing so easy from standards all the way down to hardware. Besides RIPE is going to hand them a /32 which is ~4 billion /64s without question and will keep doing that 'til the cows come home so it's not like trying to keep all of the customers in a single /64 saves them from running out of anything. Shoot I even got a /32 for a single non-ISP company without much hassle.
Also RIPE reserves the ability to retract the ISP's IPv6 space, though I really doubt it'd come to that. A lot of the original large swaths of IPv4 were considered owned not leased, that is no longer.
Also RIPE reserves the ability to retract the ISP's IPv6 space, though I really doubt it'd come to that. A lot of the original large swaths of IPv4 were considered owned not leased, that is no longer.