You need to work on this dialog.
I think it has scared off many customers willing to buy a game but not willing to send their private information to who knows where.
What this dialog is missing:
+ Who gets to see this information? Itch or the person I'm buying from? The credit card processor? All three parties?
+ Where is this information stored? On itch's servers? On the credit card processor's servers?
+ Can I see this information in my account? Meaning: If someone hacks my account, can he then see where I live?
+ How long is this information stored? Forever?
+ Is the information stored encrypted? If someone hacks your database will everything become available to him?
+ Why do I need to enter this information? Linking to ec.europa.eu is not acceptable, you can't expect every customer to study some official law document when it's easier to just not buy the game. At least provide a short explanation why this is needed on itch while you don't get this on other platforms where you can buy games.
The link you have appears to be outdated btw.
http://ec.europa.eu/taxation_customs/taxation/vat/how_vat_works/telecom/index_en...
redirects to
https://ec.europa.eu/taxation_customs/business/vat/telecommunications-broadcasti...
Also please don't just explain these points in the thread, fix the dialog. Make sure the information is there and it's easy and quick to read.