Can't sell more than 200 items via Steam per calendar year???

This just appeared when I tried to list a card in Steam:

Under Internal Revenue Code section 6050W, the U.S. Internal Revenue Service requires us to determine whether you are a U.S. citizen or resident alien before permitting you to sell more than 200 items in the community market in a single calendar year. If you are a U.S. citizen or resident alien, the IRS also requires us to collect your Social Security number or other Taxpayer Identification Number. Please note that we are not required to report this information or information about your sales to the IRS under section 6050W of the Internal Revenue Code unless you engage in more than 200 sales in a single calendar year AND the gross sales proceeds from those sales exceeds $20,000 in a single calendar year. For more information, you can view the Community Market FAQ here.

To verify your citizenship status, and if required, to verify your taxpayer information, please respond below.

Not a US citizen, so clicked the relevant button... and they want me to fill in a smegging registration form online before I can list any more items... Anyone else hit this yet?