Oh, you.
My pic is the late, great Lemmy and his amps are decidedly real. GIS tells me your pic is the black metal band Immortal.
The truth is fake stacks are nothing new, mostly due to the costs of moving around fragile tube amps. In the 1980s, Yngwie Malmsteen did a tour where the only guitar amp he used a 50W that wasn't visible on strage (but a whole wall of Marshall "stacks" were behind him.)