Why would facebook block an open source initiative, considering that they've contributed a ton of open source software (react, graphql, pytorch, etc)? The more simple explanation is that an automated detector misclassified the link because it shares patterns with spam links.
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Same as GP, I don't see what interest Facebook would have in blocking this initiative. The impact the initiative would have would have very little impact on Facebook's business. Their moat is their userbase and no amount of good "public code" would change that.