Privacy Badger dev here.

The most interesting thing from the post may be that fixing tracking redirects is partially broken in Google’s Manifest V3: https://github.com/w3c/webextensions/issues/302

Google also happens to be a major link mangler and tracker.

So, link cleaner (and generally privacy) MV3 extensions in Chrome can only offer a half-broken experience to their users. A Chrome dev recently expressed support for fixing this in the issue linked above, but MV3 is already required for all new extensions in Chrome Web Store.