Alright, well I tried checking some of the more obivously filtered/well known tags to see what came out ahead, [Though a dev would still be needed to find the true winner]
Additional Note: These counts are only of the filters
Currently being used. As well as leaving out Site filters.
Listed in order from Most people hiding it to Least:
The Clear winner by a
massive margin:
Scat: 8,924 Hide it. 1,029 Spoiler it. 536 Watch it.
Apparently Poo is just that shitty.
Sorry, couldn’t help it! =3
Runners up:
Vore: 5,574 Hide it. 647 Spoiler it. 1,747 Watch it.
Gay: 3,000 Hide it. 389 Spoiler it. 2,077 Watch it.
Futa: 2,984 Hide it. 494 Spoiler it. 3,286 Watch it.
Rape: 2,520 Hide it. 255 Spoiler it. 2,242 Watch it.
Gore: 2,395 Hide it. 481 Spoiler it. 225 Watch it.
Equestria Girls: 1,720 Hide it. 150 Spoiler it. 1,792 Watch it.
Anthro: 1,711 Hide it. 219 Spoiler it. 3,447 Watch it.
Solo Male: 1,656 Hide it. 132 Spoiler it. 594 Watch it.
OC:Aryanne: 752 Hide it. 64 Spoiler it. 863 Watch it.
Nazi: 701 Hide it. 69 Spoiler it. 134 Watch it.
Human: 634 Hide it. 78 Spoiler it. 894 Watch it.
Solo Futa: 542 Hide it. 51 Spoiler it. 736 Watch it.
Lesbian: 338 Hide it. 76 Spoiler it. 2,153 Watch it.
Snuff: 312 Hide it. 44 Spoiler it. 102 Watch it.
Fallout Equestria: 277 Hide it. 35 Spoiler it. 808 Watch it.
OC:Anon: 265 Hide it. 25 Spoiler it. 567 Watch it.
Straight: 220 Hide it. 34 Spoiler it. 1,120 Watch it.
Starlight Glimmer: 92 Hide it. 29 Spoiler it. 963 Watch it.
Well that was a fun pointless thing to do~
As this post clearly indicates. Equestria Girls is Worse than Nazis. You heard it here first folks!