They mention that they used to base their geo routing on the location of the client's DNS server but have moved to BGP Anycast. I've heard that there can potentially be routing issues for long-running connections using anycast to end users, is anybody else doing something like this and do these issues happen in practice?
As far as I know, using anycast for geo routing is pretty standard. Eg. I'm not aware that my employer (large ecommerce) has had any routing issues. This being said, we mostly avoid long running connections today. With more messenger like products becoming ubiquitous, I expect that to change though.
