Some of the dev team members who wrote the apolitical Lemmy software are the ones being accused of things. However, anyone can copy that software and create a Lemmy instance. Those devs made one called lemmy.ml that they host and moderate themselves, but everyone else is just copying the base code.
Beehawis a Lemmy instance. Same apolitical software that runs all the other instances you see, just hosted and moderated by people who would rather not see disinformation, political propaganda, and hate speech on their site.
Kbin is different software, but still uses the same ActivityPub communication so they can talk to Lemmy instances and Mastadon (Twitter-like) instances.
Kbin.social is the main kbin instance run by the developer, but anyone can host their own version