New-ish Asus routers seem to enable "Yandex.DNS" by default. This forwards all of your DNS lookups to Yandex, a large Russian search engine. I discovered this on my dad's router when he had troubles accessing his bank from his broadband but not on his phone. (Presumably, the bank geoblocked Russian IPs as a protest to the invasion of Ukraine.)
I get that you need to trust someone with your DNS lookups (your ISP, Google, Cloudfare, etc), but I didn't expect the non-ISP option to be the default...
Check your router!
