It’s been like this since 2018 because I competed the form correctly (it confirmed 0% withholding matched to USA/GB tax treaty) but the itch page still said 30% so I didn’t see any reason to start using itch payments.
Retaking the tax interview twice this week changed nothing, not even the date of the tax interview (still says 2018).
I’ve now been told by support that I should start using it regardless of the 30% warning, and upon my first pay out it will show 0% …somewhere.
I hope you can see what a poor user experience this is?