I don't disagree that things like QAnon gather steam outside the mainstream, but I don't think mainstreaming them is the right solution. I remember Reddit before it started to clean up its house. It was worse.
And yet that was the time when reddit was considered more balanced and open. People gathered there to discuss ideas. The future of the platform looked great. Nowadays virtually all popular subreddits are considered echo chambers and the future for the platform looks questionable.
Not with the subreddits it was hosting it didn't. The future of Reddit looked unviable as a business. I won't name names, but it's obvious that some of the content was wholly incompatible with mainstream acceptance and for good reason.