DLsite had a big problem with Visa and Mastercard where the credit card companies (likely due to outside pressure, not for fun) removed those cards entirely as payment options from DLsite. The issue was some tags such as loli, schoolgirl and probably some others.
Apparently they've made games with those tags invisible to at least some countries as a way to get the credit cards back.
With Celesphonia in particular, 1 month ago I couldn't see it, now I can see it again, so the specifics aren't very clear.