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I haven't logged in edX in long time but as per this article it is no longer free.

• phyzome 1y ago
  Only parts are paywalled, I think? Looks like it's specifically tests and such (graded assignments) that are affected.
  • redbluered 1y ago
    Which are where you learn.
    • phyzome 1y ago
      Depending on the subject and the person, but agreed in the general case.