https://simonwillison.net/2009/Aug/10/trim/
tr.im is "discontinuing service"
"However, all tr.im links will continue to redirect, and will do so until at least December 31, 2009.Your tweets with tr.im URLs in them will not be affected."...
tr imdiscontinuingservice
https://www.itnews.com.au/news/trim-gets-cut-down-152584
Tr.im gets cut down - iTnews
URL shortening service shut down.
tr imcut downgetsitnews