One of the cardinal rules of privacy is that someone is supposed to *minimize* the amount of data held. This is the exact opposite.
So, that is already one red flag against it.
While it is true that there might be stuff like cached data, and maybe that data should be easier to manage, this is also far more indiscriminate in what it collects.
The utility of it at this time is also largely hypothetical, although even supposing it is plausibly useful to someone, it is very over-engineered for the utility it actually provides and it's not clear why someone needs to use *this particular tool*. But, you know what, let's give it the benefit of the doubt momentarily in this post.
It is a treasure trove of information. If someone lives with an abuser (or with some sort of abusive dynamic going on), that might be troublesome.
It could be legally hazardous. What if someone inadvertently encounters illegal content? What if someone does moderation? Is that content going to be "saved"?
How might the data be managed? Can it be managed? Is it clear what is in it?