These are actually very interesting. I had not thought there was much opportunity for anything new in that space, but I was clearly wrong! Another commenter no

These are actually very interesting. I had not thought there was much opportunity for anything new in that space, but I was clearly wrong! Another commenter noted 'longevity'. Link rot is a real problem online and yes, ensuring that they will keep working even if the company behind them folds is critical. Hopefully a product like this is cheap in terms of bandwidth and could be set up with a decade or two of server usage purchased, and just keep running? One idea: custom link names. I think bitly already partially does this, but try selling subdomains, eg abc.your-shortener.com, where someone buys 'abc' from you. Then, the trailing shortname can be completely customised because there cannot be overlaps with other users of the service.