This is not particularly surprising. Lemmy was started as an anti-corporate project by leftists after /r/chapotraphouse got quarantined and later banned (subreddit for the most popular podcast and most donated patreon at the time), with the explicit goal of preventing corporate control from being able to silence leftists when they're blasting off. CTH was skyrocketing in subscribers at the time it was quarantined on August 8th 2019, and when even quarantining didn't stop its growth or slow down its activity afterwards Reddit pulled the plug under the excuse it promoted violence, but the only particularly edgy thing ever said there was "slave owners should be killed" and support for John Brown. This evolved post-ban into the assessment that Spez banned it because he wants to own slaves.
When that happened there was a massive shift in the leftist parts of reddit as we very quickly realised we'd be targeted if reddit ever deemed us to be too successful, and projects like Lemmy began in reaction. CTH's community in fact moved to Lemmy 3 years ago, and resides on Hexbear.net but has not yet joined the rest of federated lemmy due to technical issues (it used to be a fork with a different front end).
Given lemmy's specific anti-corporate origins seeing Lemmy.ml do this should surprise nobody. It's the correct move anyway.