How is it different from https://pinboard.in (besides $1/ mo)?

They pay pinboard enough for idlewords (HN user) to live off it, and buy Delicious when they went broke.

Delicious once sold to yahoo! For 15 million, bought for 35k.

https://news.ycombinator.com/item?id=14463102

Delicious spending twice as much as pinboard in running costs in 2017.

There are some detailed blog posts from the time about running costs somewhere.

Depends what you get beside storing links I suppose (cached version of content, super smart search function not limited to og: and metadata tags, super privacy, bridges to-do app maybe ?, android app + ff ext. + chr. ext. + apple thingies for ubiquitous access to links, etc.). I could see myself dropping ~10bucks a year like for bitwarden.

Not at first, at least, in my opinion, if crowdsourcing is what makes it useful. If the network effects are what makes a product useful, a subscription fee pushes against the growth of that network.

I already do: raindrop.io