That's exactly why I am reluctant to do anything with Polars. They are actively running a company and trying to sell a product. At any point they could be acquired and change the license for new releases. Sure you could fork it, or stay on an older version, but if what they offer isn't compelling enough for you then why take the risk?

Pandas on the other hand has been open source for almost two decades, and is supported by many companies. They have a governance board, and an active community. The risk of it going off the rails into corporate nonsense is much lower.