> The license granted hereunder will terminate, automatically and without notice, if you [...] initiate [...] any Patent
Assertion
The key part is that if you don't have a license to use the patented technology (or more pertinently - that license is explicitly revoked), you can't legally use that technology, no matter what the BSD license might say: the patent grants supersedes the BSD license.
So, to respond directly to your answer - you lose the right to use React; Facebook can sue you for your use of React, since they own the patents to that technology.
So if you want to operate under the belief that Facebook has no patents to assert, then yes, you will consider yourself to be safe. The fact is that many lawyers, including the Apache Foundations lawyers, disagree with this assertion.
> The fact is that many lawyers, including the Apache Foundations lawyers, disagree with this assertion.
Incorrect. The ASF's objections had nothing to do with believing Facebook had any patents, and many ASF projects are looking to move to Preact, which is presumtively covered by the same patents React would be (if any).
> The license granted hereunder will terminate, automatically and without notice, if you [...] initiate [...] any Patent Assertion
The key part is that if you don't have a license to use the patented technology (or more pertinently - that license is explicitly revoked), you can't legally use that technology, no matter what the BSD license might say: the patent grants supersedes the BSD license.
So, to respond directly to your answer - you lose the right to use React; Facebook can sue you for your use of React, since they own the patents to that technology.
So if you want to operate under the belief that Facebook has no patents to assert, then yes, you will consider yourself to be safe. The fact is that many lawyers, including the Apache Foundations lawyers, disagree with this assertion.