The README in the repo indicates it's based on the NEO-PI, which is kindof the gold standard in personality tests at least right now from what I understand.

Book recommendation for folks who might want to know more about the topic of personality psychology. Me, Myself, and Us: The Science of Personality and the Art of Well-Being by Dr. Brian Little.

I thought that these personality tests had been debunked?

We had the myers briggs test back in the day, and I've heard on couple podcasts that these tests (including MB) are highly questionable.

As it happens, the latest maintenance phase podacst is about the MB test:

https://podcastaddict.com/maintenance-phase/episode/182427039

Not listened yet, but will.

It's hard to know how objective these tests are. You feed it results, and it reflects those results back to you, so you aren't likely to be startled by the results. A selfish person who thinks he's generous will be told he is.

But I think there is value in self-reflection, and just asking yourself these questions can be of value.

I only have some concerns about their incomplete privacy policy. What's in it for them? Will my data be sold?

It's pretty good for self improvement. I scored kinda high on neuroticism but after learning some psychology stuff like mindfulness/meditation/neuroplasticity/stoicism/ACT i managed to reduce it significantly after about 2.5 years. there was even a study recently that showed how using a app to change your personality and it's not easy and require serious training like learning a language or a musical instrument. I hope we will get eventually some open source version of that app.

and of course you need to be open to it, humans have a documented bias toward not believing what might hurt there self esteem.

why in this community, though?

Why do people still take these seriously? It's ridiculous