Ask HN: What countries is it impossible to accept payments from?

PayPal does not currently work with the following list of 19 countries:

    Afghanistan
    Bangladesh
    Central African Republic
    North Korea
    Equatorial Guinea
    Ghana
    Haiti
    Iran
    Iraq
    Lebanon
    Liberia
    Libya
    Myanmar
    Pakistan
    South Sudan
    Sudan
    Syria
    Timor-Leste / East Timor
    Uzbekistan

As far as I know, it is impossible to register a PayPal account in any of those countries, and if a PayPal account is logged into from any of those countries it will be suspended until further investigation.

Stripe's global page [0] claims that I will "be able to accept payments from customers anywhere in the world" which sounds amazing, but how true is that statement really?

Does Visa even issue credit cards in the above list of 19 countries? Or is it a common thing for a Bangladeshi citizen to have a US-based credit card for online ordering?

I am posing this question because I am re-writing a SaaS website of mine, and I want to block access to my free-trial offer to any visitors from countries that it is impossible to make payments from. I would appreciate any comments relating to this as well, because I am torn as to whether or not that is the right thing to do.

[0] https://stripe.com/global