Please indulge a few shower thoughts I had:
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I wouldn’t worry about Lemmy having as many users as reddit in the short term. Success is not just a measure of userbase. A system just needs a critical mass, a minimum number of users, to be self-perpetuating. For a reddit post that has 10k comments, most normal people only read a few dozen comments anyways. You could have half the comments on that post, and frankly the quality might go up, not down. (That said, there are many communities below that minimum critical mass at the moment.)
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Lemmy is now a real alternative. When reddit imploded Lemmy wasn’t fully set up to take advantage of the exodus, so a lot of users came over to the fediverse and gave up right away. There were no phone apps, the user interface was rudimentary, and communities weren’t yet alive. Next time reddit screws up in a high profile way, and they will screw up, the fediverse will be ready.
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Lemmy has way more potential than reddit. Reddit’s leadership has always been incompetent and slow at fixing problems. The fediverse has been very responsive to user feedback in comparison.
Ideally it would be popular enough that you wouldn’t need the site modifier. Google would see that Lemmy has the most seen and perpetuated answer just like it sometimes does with Reddit now, whatever the instance.
In the eyes of a search engine, yes.
But once a site is popular enough for traffic and engagement to influence it’s position in search, it’s def going to be popular enough for bots, trolls, bad faith actors, grifters, etc.
People still often out the site modifier on just to prevent google from barfing up a bunch of crap they don’t care about, even if they know that Reddit results will be near the top.