It's a <20€ game. Personally, I have gotten way more than my money's worth, and those who haven't really wouldn't benefit from a DLC anyhow.

Game companies generally have two paths when making a game: Monetize it to fund continued development, or use the proceeds to develop the next game which will then again bring money in.

Personally prefer the prior, as i want to see the game continue, so yeah, all for paid DLC's.

That being said, the game was put up as Early Access with a roadmap containing 4 major updates: Hearth and Home, Cult of The Wolf, Saga Worthy Seas and Mistlands, these should obviously be free, as should any other addition during early access that actually impacts the game, paid content expansions belong in completed games..