Unfortunately I don’t think this code has been audited by a third party. That being said if there is not an uproar in issues in the repository or a popular fork overtaking it or a bunch of terrible online reviews, I would assume it’s relatively safe. It’s challenging to have a backdoor or scam or just bad practices with so many eyes on the source code. It’s not impossible of course but it’s rare, especially when it’s something optional, the risk is very high.

Regarding pop-ups I’m not sure I understand. A lot of cookie banners use the same (sadly due to the concentration) services so I believe by supporting only a handful a lot of the Web can be covered. If he plugin doesn’t support it, it just does nothing, letting the user decide as they normally would. The rules themselves are also public and can be checked.

Anyway nobody “needs” this so it’s fine not using it. It makes me wonder though in practice how it changes behavior, e.g do I sometimes click “allow” or “yes” because I’m just tired, and think “whatever, right now I don’t have time for this, I just want the damn information” and if so, does this plugin, assuming it doesn’t fail, genuinely help, or not.