EU has the same policy as US. Neither EU or US has released exact details of what qualifies an account as "inactive long enough" but general speculation is accounts that haven't been active in a year can be petitioned for names. I'd guess other things play into it too that make it up to individual GM's discretion, like if an account has a history of long periods between active subscriptions, or in the case of pinotnoir's toon, if the account's been active but they haven't logged into that particular server in years.

https://eu.battle.net/support/en/art...ased-for-reuse