Haha. Not only did this individual hate AMP enough to make this extension, so did Joseph Duffy https://twitter.com/joe_duffy/status/1409146065912225794?s=2..., and so did I https://twitter.com/eric_wvgg/status/1440688602321621000?s=2...

Questionable if it was ever really open source, more like "source available". The author has nor removed the source from the repo.

Most recent public fork I found is now mirrored here: https://github.com/3nprob/Amplosion

> Safari extensions require your permission to run, so in the interest of transparency I wanted to make the app completely open source.

[...]

> License: This is open source in the interest of transparency, and I hope this doesn't need to be said but please don't take this as an opportunity to reupload the code and call it your own. This is the equivalent to the GitHub "No License", so you're more than welcome to inspect the code and audit it, but you do not have permission to repurpose it as your own.

It's source available but not open source. The license part in the repo README explains that.

The author claims its open source but then explicitly omits a license to the repo, so they are misusing the term.

They are not. It’s open sourced, not FOSS