What's up with all the free titles at mangaz.com that isnt on Manga Updates?

[teriguu]

www.mangaz.com has a huge amount of free titles, and some look really promising, but from the ones I looked up none were indexed at mangaupdates. now I might just be prejudgemental but aren't mangaupdates held together by a bunch of autists who will bite their hand and scream if they come across something that isn't indexed there? Many of the mangaka aren't even added there.
Due to my interest I've often come across weird doujins and stuff and they're almost always indexed there. I just find it weird...

Some examples from the front page:
https://www.mangaz.com/book/detail/179211 - 7 chapters - Neither mangaka nor title are listed at MU
https://www.mangaz.com/book/detail/178921 - 1 Volume - Title not listed
https://www.mangaz.com/series/detail/168151 - 1 volume - title not listed
https://www.mangaz.com/book/detail/165441 - 1 Volume - title not listed (really weird lol, is this a touhou parody?)

And so on...

 

[teriguu]

Lol there's even a work by Juan Goto here that's not toddler hentai. And not on MU...

https://www.mangaz.com/book/detail/147071

(probably this is just him trying to erase the fact that he's ever drawn pubic hair)

 

[teriguu]

And bloody hell why isn't this scanlated?! https://www.mangaz.com/book/detail/148772