[jarek]

The other problem with your quest is that the sign-up fee is one-time, so competition won't cause him to lose that, and archiving users won't switch to a service without archiving and full-text search no matter how free and open source it is, so he won't be losing the ongoing revenue from them either.

I don't expect Pinboard to be around forever, but it's useful enough while it's alive to be worth the money for me. When it's no longer useful, I'll still have a copy of my data to grep to my heart's content.