While there are plenty of PAKE protocols, especially those augmented ones which are practical in C/S model, actually they seem to be not widely used. Even TLS-Standardized SRP, the most popular one among them, I just know it's used in apple's iCloud. In addition, J-PAKE was used in Mozilla's synchronization but aborted for its weird usage.
So, Is there any situation or famous system in which PAKEs are widely used that I don't know? If no, why are they not used even when their patents are expired?