If anything, shouldn’t it be encouraged, and even automated? I’m including even the ‘old’ stuff from reddit here. Reddit shouldn’t be the absolute owner of the content submitted by users. When I migrated here, it wasn’t because of me being against reddit users, but being against reddit the company. Copying the content here actually hurts the company in sense that they don’t get to then gatekeep the crowdsourced content.
I’m also a prolific commentor. I’m unlikely to comment on something like an AITA post that was copied from elsewhere by a bot, but that hesitation doesn’t apply if it’s like a news item or a meme. Maybe if there are suddenly hundreds in a row I’d be less likely.
Even on Reddit, much of that kind of content originated on Facebook, Twitter, or whatever.