According to this article, .io domain will be nuked soon due to geopolitics. 

https://www.computerworld.com/article/3552692/is-the-io-top-level-domain-headed-...

What's going to happen with itch.io in this case? Are there any fallback mirror domains?

https://itch.io/t/4182661/what-will-happen-to-itchio-when-io-tld-ceases-to-exist...

There is a pinned reply in the thread above from leafo. Did not sound like there already is a fallback. And the soon will be some years.