My own experience using Reddit is that it's really a mixed bag when it comes to forum moderation.
On some of the forums, moderators seem to do their due diligence and people receive warnings before outright bans, with explanations of why they were warned.
In others, you just get a sudden permanent ban, with nobody ever replying if you ask for an explanation.
For example, I work for a company that uses "Docuware", a fairly expensive (and somewhat obscure) document management software package. We paid to migrate our on-site server to their cloud-based solution a while back, but during that process, our support contract expired for the on-site version. We were assured we didn't need to spend the money renewing it just to get help finishing the migration. But we ran into some issues in the meantime (largely because we had to hold off on cutting over fully to the cloud, to retain compatibility with an outside vendor we shared some of the data with). I discovered Reddit had a Docuware subreddit (woo!), and asked a couple questions in there. I got a public reply from a guy in a foreign country who promised he could assist me. But then, he private messaged me, hitting me up for some large hourly fee. In other words, he was just looking for targets to sell his services but pretending he was just another helpful user in the public forum.
Shortly after I sent him a private reply thanking him but declining his services? I was permanently banned from the subreddit. No explanation... nothing. Looks like it was really just set up for Docuware consultants to make a few bucks.