I’ve been on Reddit for 16 years and I’d say yes it’s very similar. Like Reddit back then it was very tech focused and quite liberal.
I do think people are a bit more vicious online these days than they used to be and a bit more polarised.
From a content perspective there used to be more blog content than tech news content, but it’s fairly similar. What I like about Lemmy is it’s far less commercial and the conversation is more genuine.
However I don’t think Lemmy will become Reddit in 15 years, I think it may languish in eternal obscurity and I’m actually okay with that.
Reddit exploded when Digg crumbled and the same could happen with Reddit crumbling but idk, there seems to be some stickiness to Internet websites these days.
Regarding stickiness, perhaps it’s because the internet is ubiquitous now. Fifteen years ago, those of us on Fark and Digg and Reddit came to the internet for a lot of things. Notably, we kept in touch with friends that way (MySpace and Facebook) and in particular, we got our news that way. My parents were incredulous forever and still kinda are that I “don’t watch the evening news.” Now everyone uses it for everything. The big difference is that the early adopters are naturally more open to change because they adopted something that was a change. The rest of the population was slowly pushed into it. Now they don’t want to leave the sites that they’re used to (e.g. Reddit and Facebook) because they aren’t that open to change in the first place.