If you got banned a lot of Reddit, the problem might be you.

Or the problem might be reddit i.e. a problem reddit has with free speech:

• reddit is like many other social media subject to campaigns of propaganda by companies, groups, state-actors.
• bots are common place and are influencing discourse

Social effects like mob mentality take place, so if you are an individualist and say it how it is you are going to be surpressed just for voicing a legitimate opinion.

You clearly cannot question the prevalence of bots and large scale manipulation by bad faith actors (say for example a company that systematically downvotes or through their mods bans all unfavorable comments about flaws in their new product).