It is not my responsibility to make sure that citizens of Elbonia aren't able to use my application if I don't operate a business or live in Elbonia. It comes

It is not my responsibility to make sure that citizens of Elbonia aren't able to use my application if I don't operate a business or live in Elbonia. It comes down to jurisdiction. If you don't have it on the default marketplace for the region, and don't have a physical business presence in the region, it can be argued, you've done enough and aren't subject to the jurisdiction and are not doing business there. That users may bypass and side-load your application is immaterial. If a user in the UK uses a US based VPN, they can also still use the app even if you added IP blocking, and IP blocking in and of itself is less than perfect often subject to false positive/negatives, and best to be avoided.