Reddit in general has an extreme left leaning bias. It's become more pronounced as they purity spirals banning anyone they perceive as a "right wing troll" even if they are banning people who are more or less leftists themselves.

It's a common problem in politically "woke" spaces of any persuasion, why the old adage of "don't talk politics or religion in mixed company" existed.

The real problem with Reddit isn't so much that the users have such biases but the way the upvote downvote system works and the ban happy mods does more or less mean that you won't see many right wing positions getting much coverage unless they are in the context of leftist outrage over them. It's very much an echo chamber.

The star trek subs in general have had a lot of problems. Most people didn't like the newer star trek series for various reasons, politics not withstanding, but it turned into a purity spirals, and the moderators of the main star trek sub were going around banning anyone who criticized the new shows. An alternative sub formed that was less censorious but like all the alternative subs on reddit that formed due to poor moderation on the main sub it was eventually banned.

Reddit moderators are mostly spoiled adult children who can't function in the real world where the might have to actually have a conversation with someone who doesn't share their views, instead they have a pathological need to cultivate a space where they can wield their dictatorial aspirations to power to ban any kind of opinion they don't like so they can maintain a fantasy where they are well liked and their opinions popular against the brutal reality where they are the exact opposite of what they aspire to be.