If the link you are trying to send is just some kind of harmless confirmation link (e.g. subscribe/unsubscribe from a newsletter), then at least use a form inside the web page to do the actual confirmation through a POST request (possibly also using a CSRF token), otherwise you will unequivocally end up with false positives.

Confirmations are a little more difficult, as senders really do want to keep the transaction as low friction as possible. Adding a confirm button may result in people abandoning the confirmation process.

But all of these attempts misunderstand why the Open Source ecosystem is successful as a whole. The ecosystem of fairly standard licenses provides a level playing field that allows collaboration with low friction, and produces massive value for everyone involved – both to those that contribute and to those that don't. It is not without problems (there are many essential but unsexy projects that are struggling with funding), but introducing more friction won't improve the success of this ecosystem – it will just lead to some parts of the ecosystem to break off.

I wanted to use GitHub Gists which are a wonderfully low friction way of sharing code

Everything Lives in GitWith a Jamstack project, anyone should be able to do a git clone, install any needed dependencies with a standard procedure (like npm install), and be ready to run the full project locally. No databases to clone, no complex installs. This reduces contributor friction, and also simplifies staging and testing workflows.