What is your opinion on websites blocking visitors from specific countries (geoblocking) for personal or political reasons?

There are a few countries out there that people love to hate. Sometimes they choose to block all visitors from those countries to their websites. What is your opinion on the practice? Note that I am not talking about blocking for legal or copyright reasons, or about blocking done by the countries' authorities or ISPs, only by the websites themselves.

Does your opinion change depending on whether the website in question is a personal website or blog, versus a website for a free/libre/open-source software project, versus a public service (e.g. a Fediverse instance)? Would you stop using your Lemmy instance if you learn that it is blocking visitors from certain countries?