> The “Platform” is just the website

Arduino is the platform, not the website.

  From the same terms and conditions, in the first 2-3 paragraphs where they define the terms:

  "The use of the Arduino Platform and the Services (each as defined below) available on, from, or through Arduino.cc (“Site”) ..."

  "By using the Site, the Platform, or the Services, you declare to have read and accepted ..."

  "If you are under 18 years of age, you may use the Site, the Platform, and the Services only with the consent and supervision of your parent or legal guardian."

Further, in section 1.1:

  " ... and to further develop the Arduino open source ecosystem (collectively, the “Platform”). The use of the Site, the Platform, and the Services is governed by these Terms ... "