There are several. Here’s the first four I saw.
https://us.forums.blizzard.com/en/wow/t/oce-player-stop-complaining-about-price-changes/717024/
https://us.forums.blizzard.com/en/wow/t/is-the-aus-subscription-price-outrage-justified/717028/
https://us.forums.blizzard.com/en/wow/t/when-the-aussie-dollar-was-stronger-why-wasnt-the-sub-price-decreased/717006
https://us.forums.blizzard.com/en/wow/t/blizzard-this-is-insulting/716950/