In that sentence, "kind of" is used to soften the sentence. As in, he doesn't want to bluntly say "The money comes automatically", and instead wants to say "The money comes without much effort", suggesting that while he puts in some small amount of effort to make the money come, it comes easier than one might expect. "Kind of" can be used extremely flexibly to soften a wide variety of sentences. If you want to imply some uncertainty, you can kind of just insert it before a verb or adjective. It's kind of easy to use.

Hi! Here, "kind of" doesn't refer to the kind/type of something; it simply means "somehow". The money somehow comes automatically. Another example: He kind of lied to me when he said he spoke perfect Russian. He doesn't speak it that well. (He somehow lied to me when...)