Any website that implements ActivityPub APIs properly can federate with other sites as part of the fediverse.
In the light of the above ☝️ statement and in the context of the given lemmy post, l am presenting three websites as an example :
Can such websites be created and made to federate as a part of the fediverse ?
The community exists in some lemmy instance ?
It is it’s own instance that renders on lemmy as a community