Because that is the size of a single subnet, so you cannot do any useful network design with that. Also, mind you that they have a /29 assigned from RIPE, so t

Because that is the size of a single subnet, so you cannot do any useful network design with that. Also, mind you that they have a /29 assigned from RIPE, so they would have sufficient space for 134,217,728 /56s or 524.288 /48s. They choose to leave all that address space unused for nothing, forcing their customers to work around a completely artificial scarcity of address space. Exactly the opposite of why they got a /29 from RIPE (and they could easily get more if they did actually manage to use it up).