Haha @Reloadscript
don't overthink it, man! You're probably not even going to use that map or any custom map anyway! It's a common understanding!
Ultimately, it's the server owner's choice whether their server is customized or official.
If a server is customized, players will already be aware of that, and every server provides a guide and details about any changes in their info! xD
There's really no issue with this content; it's simply a map showcase, and you're the one making it more complicated, haha! Try not to be too skeptical; customization or mods in any game are totally normal.
Well everyone gets your opinion but it is too obvious man, that this is a custom map! xD