“In response to an inquiry to the FAA’s UAS help line, that concerned whether membership in a CBO is required to follow Section 336, the FAA responded, ‘the FAA does not interpret P.L. 112-95 Section 336 as requiring membership in a CBO, nor the the FAA list any CBOs. You must only follow the guidelines of a CBO.’ This statement ignores Congress’ requirement to operate within the programming of a nationwide CBO... (emphasis added)”
- Rich Hanson, President, AMA, February 2018 Model Aviation Magazine, pg 6.

“Currently, if you are not a member of a CBO and following its rules, you are required to fly under Part 107 (emphasis added).” - Randy Cameron, Executive Vice President, AMA, February 2018 Model Aviation Magazine, pg 124.

“To fly a radio controlled aircraft in the United States, there’s only two ways you can do that right now. You either get a 107 UAS Remote Pilot Certificate … or you follow Section 336 of the Public Law, which outlines a process where you can be part of a community based organization and then follow their guidelines. So basically AMA is the only one at this point … So you either have a 107 certificate or you’re a member of the AMA (emphasis added).”
- Tony Stillman, Flying Site Coordinator, AMA, undated interview approx 9 months ago w/ Hobby Geek (approx 15 minute mark)

And these don't include the video where Executive Director of AMA also says ".... you have to be a member ...."