In all fairness, I am sure it wasn’t Music Box who did the punishing. After Brexit, sending something commercially the UK from Europe became a costly bureaucratic undertaking, that many companies simply (and understandably) said “f$%! that”.
The other way around, too, which is why I don’t order anything from the UK anymore. Ironically, it’s cheaper for me to order Varèse Sarabande CDs from their US store than it is from the “international” (but in reality only “UK”) store.