>But the nature of 8chan's user base isn't being dictated by its design. It's still an overwhelmingly right-wing site that gained its prominence from the Gamergate controversy. As a frequent user of reddit I would openly declare that overall it's an observably left-wing site.

It's somewhat true, but still, reddit hosts right-wing communities like /r/the_donald, while 8chan hosts, for example, /leftypol/.

Both sites consist of multiple, separate communities.