In my view this shift is happening because of social media. The social media short cut to having friends turned out to not really work, and now people are trying to figure out how to have friends again. It's the same with dating.
Is it because it's impossible to maintain meaningful relationships over the internet? My experience in the online forum and gaming communities implies otherwise -- some of my most meaningful friendships started (and continue) in those communities.
I suspect, instead, that it didn't work because Facebook murdered it. They abused dark patterns, injected ads, suggested content, radicalized grandmothers, and hacked engagement to the point where relationships didn't just stagnate, they withered and died because they were hidden and forgotten.
I have a lot of chats and friends in Telegram, and it's very easy to maintain those chats over time because I have a chronological feed of interactions right in the app. Facebook hid and diluted an entire medium, their original focus, "posts from friends" in favor of content they thought you might engage with more. Facebook chat exists, sure, but app invite spam diluted that to hell just the same, so it doesn't have the same chronological list of meaningful conversations that I have in Telegram. And notification spam diluted the meaning of any new developments on Facebook -- comment replies, messages, whatever.
And now, Facebook pushes videos, "TV", reels, stories, and god only knows what else instead of just letting me see posts from my friends and family. I think it's fair to say that online social relationships can work... they just don't work in a hostile environment. It's kind of like maintaining your friendships only in the middle of Times Square, surrounded by ads, tourists, and costumed performers trying to scam you out of $20 for a picture. Not impossible, but eventually you'll get tired of it.
Yeah, it seems like people are doubling down on a losing strategy. The real solution is usually involves going outside your front door and meet people. The same is true with dating.
Over the last 25 years, all but one of the people I've dated, have been people I met online, including the mother of my son. Most of them have been people who I'd never have crossed paths with if it wasn't for meeting them online.
Under no circumstance do I want to go back to the horror of relying on meeting people offline, without being able to quickly filter out people I'm not compatible with first.
I don't think most people actually get to know like minded individuals on social media. They just flock together on specific topics and don't associate where they disagree. When you meet people in the real world, chances are you are unlike in some ways by default. People just don't express their differences in superficial context. You don't find the differences unless you ask and listen. At least that's been my experience meeting people.