They switched to a non-free license about 6 months ago [0]. This is not just the usual BSL terms of "do not compete with our hosted offering, but use it in your own product without issue", but they mandate telemetry from the free version.

Oxide and Friends did a great episode on it at the time [1].

[0] https://www.cockroachlabs.com/docs/stable/licensing-faqs

[1] https://oxide-and-friends.transistor.fm/episodes/whither-coc...