It's often framed as a system of moral philosophies and the way the impact our behavior and interactions with the world and society. So yes, in many ways, veganism is a religion, or at the very least religion adjacent. Religions aren't limited to belief in a magical sky daddy.
To be clear, it is clearly bigotry to use "religion" as a label in an effort to be dismissive of anyone's personal moral belief system or philosophy.
Self-hosting is inherently not low effort. This isn't memes or shitposts. This is people helping people that are trying to help themselves, a.k.a. people making an effort. Communities rely on the discretion of mods and rules specific to the community focus. If this community didn't have some kind of bar to meet for low effort posts it would drive away participants and contributors more interested in higher effort and more interesting topics. It gets real old seeing people ask and answer the same basic questions about Plex, Jellyfin, *arrs, and docker all the time. Worrying about if this rule will be abused seems premature. Besides (as others have pointed out) there are other communities with similar interests, if you're that concerned that your spammy no-context YouTube video got deleted, please go try your luck elsewhere.