Ads and Terms of Service

On the GitHub mailinglist there is currently quiet a weird discussion going on regarding following clause in the terms of service there:

7. If you are using a free account you are not permitted to block ads.

The discussion more or less is centered around the question, how GitHub plans to enforce this condition. The funny part comes, when you just google for this term and notice, that this isn't really GitHub specific, but more or less part of a wildly used set of TOS.

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