Site just taking over walkthroughs from the steam guide section without asking permission.

There are many, many, many sites like this. I guess these using some kind of automatization, sometimes i hid messages like, "this guide was made by Csontzuzo on steam and if it shows up anywhere else then the guide was copied from there", or the first alphabet of sections in the guide gave the result "made by csontzuzo", and so on, just for fun. Not like you could do anything against this, copy paste news portals, sport portals, contents, stealing easier than creating your own :-D But the guides are made to help players anyway, so.... but yeah, at least a credit to orignal creator.

This happens quite a bit, mainly on obscure gaming sites that nobody cares about anyway. The legitimate ones don't do this kind of thing.

I've had people copy my Steam guide pretty much word for word likely just put into Google Translate and then posted as their own work in a different language, uploaded on Steam next to my own guide, without giving any credit. Every single paragraph is styled in the same manner so it is incredibly obvious. People can be quite lame sometimes. Steam doesn't even bother moderating pure troll posts so I doubt they'd care if I reported it.

Here is an excerpt from https://store.steampowered.com/subscriber_agreement/#6

When you upload your content to Steam to make it available to other users and/or to Valve, you grant Valve and its affiliates the worldwide, non-exclusive right to use, reproduce, modify, create derivative works from, distribute, transmit, transcode, translate, broadcast, and otherwise communicate, and publicly display and publicly perform, your User Generated Content, and derivative works of your User Generated Content, for the purpose of the operation, distribution, incorporation as part of and promotion of the Steam service, Steam games or other Steam offerings, including Subscriptions.

From legal point of view, any user-content you uploaded to Steam is fair game. But I agree with you, if one copies it, a simple attribution to the original author would be nice, it's simply the decent thing to do :)

There's another site that steals achievement guides as soon as they're uploaded as well, they do give credit to the author though. That doesn't make it right though. It's basically scummy people making money of others.

Websites that steal content from people like Csontzuzo should be hog-tied and horse-whipped. /$0.02

Such is the life of a guide maker, you make something for free, someone else profits on you.
You wanna see something funny? This guide links to a website of a text walkthrough that was copied from my guide on Steam. :D At least that website gives credit.

You can write them with the hint that you have the copyright on your walktroughs and if they don't delete the stolen/copied version on their site you will let your lawyer handle the rest with them.
It have a date when you wrote it and it have a date when they wrote it, so it is very easy from the copyright law side.

If you hire a lawyer is a other thing but maybe they don't want to find this out....

Reviews of my curation got copied, word for word, from other ones too, mostly translated into other languages.
I contacted a few of them and none wanted to find out if i hire a lawyer or not...