have a look.

[Cranky Old Man]

Honestly, you can't blame PDP, he never asked for people to make him crappy maps (for the record, I am definitely not a "bro").

To tie into what Your Computer is saying: A GOOD PewDiePie map, would include Stephano being available for carrying around and being talked to, no notes (because he never reads those) but any short messages should be signed "Martin", and a plot where barrels are behind everything.
That's what PewDiePie LIKES.
Oh, and nothing too scary either, because that makes PewDiePie feel scared, and feel less awesome "like a boss".

K got it, brb. Gonna make a custom story hastily constructed in 10-15 minutes that will have flying naked people, barrels, and terrible level construction that consists of having mansion base floors, dungeon base walls, and castle base ceilings. O, and I'll include the upside down hanging prisoner and those blue torches that are always out of place, overlord Pewdie will be forced to notice them!

Sarcasm. Have you noticed it yet? Sadly, that's 60-80% of custom stories made for him. Actually, scratch that; that is a majority of all custom stories nowadays.

I'm just saying that technically PewDiePie can very much be held personally responsible for these stories, because not even good PewDiePie maps are good Amnesia maps. They might be good HPL2 maps, but that's different.
As for the number of them, like I said, hastily made maps can be made more often, while ambitious artists instead often give up on their projects before their completion. I can make 2 The Closet maps a day if I wanted to, or maybe 10 if I put some effort into it, but I can't crank out 1 good story a month even if I want to.