I think there are several reasons:
-FTGGOG was performed only on one tour until 2018.
-Most of AMLOAD was kinda forgotten because, well, none of it was performed for quite a while (that's for casual fans and new fans).
-It's a song that also doesn't have those sing-along moments like WTWWB or even Dance Of Death.
-It isn't featured on any live album. BNW songs are on RIR, DOD are on DOTR, TFF are on En Vivo, TBOS on Live Chapter. AMLOAD ones? Nowhere, because of that failed Download recording.
-IM fanbase grew considerably during the 2008-2010 period thanks to SBIT tour and a lot people were not exposed to AMLOAD.
-When people hear a live recording where the audience sings, they are more likely to engage into singing the song when they hear it live.
Also, I'll just throw this there. In Helsinki, 1st night, FOTD was one of the songs that got the least response from the audience (at least first 10 rows) along with FTGGOG, which just proves that us diehards, are bored of it

, while we went nuts during Clansman, Icarus and WED.