If you have doubts about a link, don't forget that you can long press it with #Fedilab to get more information.
Also, the app lets you know if links try to redirect you.
See media descriptions. #FedilabTips
Which HTTP client actually tries to resolve the URL to check for redirections and hence ultimately shows up in the logs of the potential URL shortening service?
* The Fedilab *app* on the mobile device?
* The home instance of the account that is checking for redirections?
* Some server or service run or used by Fedilab?
* Or ...?