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The only legitimate criticism I've heard of the FB patent grant is that FB could intentionally infringe your patents and the you couldn't sue them for infringement without losing your React patent grant. It's such a narrow case though that I seriously doubt it's a legitimate concern for most of the people complaining about it.

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And you can stop using React, then sue. Even if they also stop using your patent, they were in violation when they used it. They can't retroactively put you in violation with their revocation.

Moreover, nothing is preventing you from informing them of your patent and asking that they stop using it. If they continue to, it's clearly willful infringement.

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