If you haven't noticed, every website and app tries to track everything you do. Since apparently tracking cookies aren't enough, some apps and websites add a tracking parameter to the URL they give you for sharing. When this is clicked, it is trivially easy to enrich the advertising profile they have on you - if you send a link of a cat to your friend and they open it, this means they might like cats. And so on.
I find it annoying. That's why I wrote this little app. It adds an item in your share menu which copies the shared text while removing the tracking parameters.