Many bookmarking tools were created, and then most got sucked into the tech's "how do I make more money cycle?" and died.
My favorite was delicious, and then Pocket. Even Google had a bookmarking extension.
Is saving links no longer considered fashionable?
Yes, AI, but how does it go back to my favorite that I need to either read or revisit?
Should I vibe code one?
OTOH, back when del.icio.us was good, I used it for roughly the same purpose.
These days, I still send links to Instapaper when they are essays or articles. I send links to Raindrop.io when they are anything else, basically anything the Instapaper text extractor would fail on. Things like repos, interactive charts/graphs, photographs, videos, etc.
I still think it is behaving roughly as /dev/null. I do sometimes think that, at least nowadays, you can ask an LLM to visit your bookmarked links and do some semantic search over them. But I guess the best use case is just saving it for later/never rather than wasting time on it now.