Tinder is an ever changing and evolving platform. It develops quickly because it has to keep up with the lives of the people who use it.
Tinder links expire because having permanent links just doesn’t work. Profiles are constantly created and deleted. Users will continue to download and reinstall the app. As changes occur, the app news to stay fresh and old links just will not last.
The best defense to this is simply to understand these links will not last. Do not anticipate having use of these links in the future. Save anything you can to be prepared for when Tinder links expire.