a. they encouraged people to adopt Swift, even going so far as to release Swift before it was ready for production use;
b. they didn't warn people that using some feature or other might in future require a patent royalty payment;
c. they didn't come out publicly and say "here is our policy" about these patents to put people at ease.
By licensing its contributions under the Apache license, Apple has granted you a perpetual, royalty-free license to use all of its patents that are necessary in order to use Swift. That is a legally-binding statement written plainly in the license text. Your complaint is that we didn't make a second, non-legally-binding statement about our "policy" which promises to never charge you a royalty that we've already legally given up our right to charge. Even if we made that statement, I can't imagine why you'd trust it more than the plain terms of the license. I can only encourage you to talk to an IP attorney who hopefully can explain these things to you in a way that you do trust.