Lemmy isn’t a site, it’s a piece of server-software. The software is written by a couple of people with bad political opinions, who also run a popular site using that software, Lemmy.ml.

You can skip using Lemmy.ml and just use another server using this software. The software itself isn’t magically poisoned or anything!

From what I understand, one of the core devs (Dessalines) is a Marxist-Lenninist; they later founded the second Lemmy instance, Lemmygrad.ml.

Recently, there was some discussion on Lemmy.ml’s (the first and official-ish instance) policy of banning any crticisms of China’s government (e.g., even mentioning the Uyghur genocide) on their own servers.