Great project though! Opening up these sort of semi-encumbered datasets is what keeps humans well informed
I'm from MI as well and always wondered about deeper datasets for watching money and influence change hands
I agree with what you're saying though, it would be cool to take something like those property owner layers and find the ultimate legal entity for stuff like LLCs owning land.
E, only semi-related: In the 'urban design' part of the internet I've seen really cool mapping that puts bar charts on top of a city's grid, with the bar charts being how much tax revenue the city generates. It's really stark to see skyscraper-sized bars in downtown cores and mostly flat all around where cities have zoned residential separate from commercial, or even where suburbs tax less than the core city.
Gaia GPS [1] is the one I use. It's got a lot of layers for free including land ownership which properly shows all of my neighbors plots. I use it often when collecting rock specimens and mushrooms to make sure I'm on public land that allows it or to figure out who to seek permission from.