Is ARK permanently free on Steam?

Excuse me, I'm curious about the game ARK on Steam. I noticed that it's currently available for free, but I wanted to clarify whether this is a permanent offer or if it's just a limited-time promotion. I'm interested in downloading and playing the game, but I don't want to miss out on paying for it if the offer expires soon. Can you provide any information on whether ARK on Steam is indeed permanently free, or if there's a specific timeframe for this offer? Thank you for your help.