I sometimes get that feeling when I run across someone’s personal blog, and it hasn’t seen updates in quite a long while (yeah, like in ten years or so). However, as with most of the other replies here, I tend to just assume they’ve lost interest and moved on.
I’ve had some blogs like that myself, and I’m certainly still alive (I hope, lol!) Some of them already gone with the sites themselves like Multiply, if you ever remember that, also, Friendster blogs—all this in the late 2000’s and early 2010’s. Then there’s some Wordpress blogs I used for a while back in 2015~2018. I just got lazy, lost interest, and so left them in the dust.
Thus, yeah, I simply assume they’re doing just fine, and have just moved on with their lives.
However, there’s a different feeling for when I browse the blog/social media profile of someone I definitely knew has already passed on. It hits different. It’s like a frozen snapshot of their life. Their final post just there. A lot of times, the final post doesn’t even indicate anything. Their lives just went on as normal until it didn’t, and it just hits me differently than someone who I would just assume have just stopped posting.