A bit. Reddit has been a big part of my life for over a decade. If I lost access to all of those communities, it would be really unfortunate and hard to accept. I'll miss being able to get amazing advice or insightful comments just by adding "reddit" to my google search.
I think the spirit of Reddit will live on though, I doubt that everyone will just vanish and we'll all be stuck on subpar platforms like Twitter, Facebook, or Tiktok.
I'm really excited about the possibility of the new "Reddit" being a federated, self-hostable platform like Lemmy, and solving these periodic exodii issues once and for all! No more dictators deciding the direction the community should go. I'm really impressed with what Lemmy has accomplished so far with its code and its community.
Just speaking for myself, I find absolutely no interest in those platforms you mention: they do not show any really depth if you know what I mean. I love going around various sublemmies (if that's the word) and discussing these absolute niches.
They just call them communities officially. But I think sublemmys will become a slang term. I'm honestly torn, I like both sublemmies and sublemmys, not sure which one will win out