Free For All links: is it effective or not?

Busby SEO challenge is getting bigger and bigger, different methods may be used but there could only be one question, are FFA (Free for All) links effective?

Well as I have researched, FFA links may give you lower reputation to your sites. It is a black hat method of building links from uncategorized link pages. Like link farms, FFAs are list of links that is placed in 1 page containing different categories.

Keyword stuffing all the way

According to Google, we must not put unrelated keywords in our site to avoid bans. This method is used to cheat search engines. Example, a user typed a keyword in the search engine and list of results are viewed, but one website is opened. But the user realizes that the site is not related to the keyword/topic he searched. Now, Google bans sites that use unrelated keywords in any part of the website. For example, Alex Chiu's website:

As you can see, Alex Chiu's website is very simple and clean.

But wait, what is this?

Woah, I see, different keywords in a textarea. That is why his site is banned by Google.