Another example of that: There was a WhichWich already participating in the Anaheim area (plus some other locations elsewhere in the country), but for example the WhichWich location in West Los Angeles (which opened a year or two ago) didn't join until this latest binge.

So perhaps they shifted from signing up only individual locations to (also) signing up entire chains at once, like they did a few times before for national chains but haven't appeared to have done for a long time for local chains (ever since Daphne's came and then went in SoCal, quite a few years ago)?