Another point --
Recall that the SSPX has, in many instances, claimed that the Resistance is non-Catholic, sectarian, evil, mortally sinful, etc.
So if they allow videos of our "satanic mortal sin wallowing" which looks SUSPICIOUSLY LIKE THE EDIFYING WORKS OF THE CLASSIC SSPX, it might get a few people to stop and think!
Again, that would break the spell, so they just censor it. They don't rebut or "limit the damage" by posting comments on the video -- no, they just delete it. It's too dangerous to their propaganda and well-crafted illusions they have created for the faithful.
They may have fooled many, but they haven't fooled me, or many others here on CathInfo. I, for one, see right through their tricks.