[2019] Bethesda,Why can't we buy ATOM with PS4 in JAPAN?

Since Japanese PS4 users can not purchase ATOM, they can not do shopping at the atomic shop. (On the other hand, Only XBOX in Japan can buy ATOMS) My friend is sorry that I can not shop at atomic shop every time because of PS4 user. I want you to answer. Why can't they buy ATOM with PS4 in Japan? (Is it a system problem, a legal problem or a cost?) Many Japanese PS4 Fallout76 Fans have dreamed of buying atomic shop items on PS4 too.I hope it.

Sincerely.