R3ap4r knew what was going on before most understood:
"Unless this is resolved in some way, the general ranking is borked.
Only playing, unlocking, locking at certain maps is playing the system, plain and simple."

Wonder if knew system will make changes to this as well since it is stupid to allow and it's clear to everyone who plays for rating somewhat seriously and looks at high raters on FA2 whats going on. I can say that Aspirin doesn't abuse this feature (or has only a handful of times I've seen) since he is plenty active enough to be able to rate each map he chooses to.