Needless to say, I'm a member of the AMA. However, I have never received a NOTAM from the AMA. Nor do I remember seeing any AMA rule that instructs me to be aware of a NOTAM.

NOTAM is an acronym for --- Notice To Airmen
Airmen are assigned Certificates (with a Certificate number) from the FAA.
The FAA did not issue me an Airmen Certificate when I joined the AMA. I don't need any form of a license to fly an R/C plane. So the FAA doesn't regulate me with NOTAMs.
We are not airmen. We are R/C "pilots" for the lack of a better term. (The word "pilot" really shouldn't be used in reference to us ... We who stand on the ground holding a transmitter.) We are simply hobbyists.

As I wrote earlier, "The FAA uses the concept that if they create a false premise and keep hammering at it, it will eventually fuel rumors that morph themselves into fact or accepted concepts."
In doing as the above, the FAA has convinced many people that they can govern organizations they don't regulate. And the NOATMs regarding the use of R/C aircraft that the FAA publishes is just another part of their arrogant dogma that many people have come to unfortunately accept.

The few people that have stood up to the FAA regarding these matters have succeded, but it did cost them thousands. Unfortunately, the FAA employs the schoolyard bully tactic with their lawyers. They have no case, but they will attempt to bury you with legal fees until you go away or give up. They are just a bunch of blow-hards.

And wasn't it just within the past year that the FAA actually dropped a case against someone for using an r/c FPV drone?

The FAA would have to completely re-write all their Rules & Regulations to align with each other in order to enforce their "rules" for R/C aircraft and the like. As it is now, a decent lawyer can punch holes their attempts to regulate our hobby or sanction anyone simply because the FAA "rules" or attempted rules are riddled with flaws and have no basis, and are contrary to their other rules.