I first noticed this yesterday and from a little research, it looks like the subdomain only started popping up a few days ago on the 22nd. For a while now, if you googled a subreddit, the second result would usually be a beta.reddit.com link to the same subreddit, and it looks like now 110club.reddit.com now pops up sometimes as well. Old.reddit, 110club.reddit, and beta.reddit all seem to be the same thing, hopefully this info helps

I kept seeing 2018coronavirusbeta-gnusa reddit

OP and rest, where are you guys located?

I’m in Israel using quad9 dns, but with a VPN didn’t see those results.

Let’s see if it’s a regional thing

Not entirely sure, but I have some idea what’s going on:

Reddit redirects URLs of the form .reddit.com to www.reddit.com/r/subreddit, you can easily test that yourself by clicking this link: https://techsupport.reddit.com. However, if you take a “deeper” link like the link to this post and replace the www with a subreddit, you get something like this:

https://techsupport.reddit.com/r/techsupport/comments/182tb9i/what_the_hell_is_the110clubredditcom_that_i_get/

That link then redirects to www.reddit.com/r/techsupport/r/techsupport/, which reddit doesn’t like, and you just get an error page.

This seems to be broken for any subreddit with a number in it though. For example, https://the10thdentist.reddit.com just brings you to the old.reddit front page, like your example. And it also works with “deeper” links like posts: https://the10thdentist.reddit.com/r/techsupport/comments/182tb9i/what_the_hell_is_the110clubredditcom_that_i_get/. It also doesn’t have to be a real subreddit, anything with a number in it seems to result in the same behavior.

So… my guess is that someone at reddit fucked up these redirection URLs, and it results in Google wrongly indexing these links as if they were separate sites from old.reddit.com.

The first rule of the 110 Club is, “Do not talk about the 110 club.”