The free, traffic-requiring TLD: .tk

Oh boy I remember being a teen and all the gaming forums and gaming communities always started out with a .tk site. None of us had credit cards so it was the go to for starting a project.

I remember having one of these when I was a teenager and wanted a domain for free.

Are they doing this to increase the number of non-spam domains so the overall .tk domain use looks more legitimate?

Doing what? All I see is the Wikipedia article for the TLD.

I read this and am not sure I understand why it's interesting. Can anyone provide a .tk TLD TLDR so I can say, TIL .tk?