[Eriks]

No, it's public and has been run for 11 years already and will continue to do so in foreseeable future. I would say it is the most popular one in my home country and it has good reputation among users. From my experience most linkrot issues comes from the fact that sites and documents URL shorteners link to go down before URL shorteners themselves. Many websites from 11 years ago doesn't exist anymore.

[dejj]

Do you have some form of information escrow in place? E.g. could archive.org store a page of all your short-url mappings?

[Eriks]

Not at the moment but Archive.org is an option I'm considering.